PSS convergence in PLL simulation

kunalsan · Feb 6, 2019

hello,
I am trying to design a type-2 charge pump PLL. but there is a problem with PSS simulation in cadence spectre simulation. I am designing PLL with the 19MHz reference frequency and VCO output frequency is 2.5GHz. and I have used divider ratio 128. for divider TSPC latch is used.
please give your kind suggestion.

pancho_hideboo · Feb 6, 2019

First, PLL has to be integer-N type not fractional-N type.

Show me netlist fragments regarding PSS settings and Option settings.

kunalsan · Feb 7, 2019

Hello,
yes, I am designing an Integer-N type PLL.
The netlist and PSS setting are given below.
PSS setting snapshot:-

netlist:-

Code:

Cadence (R) Virtuoso (R) Spectre (R) Circuit Simulator
Version 15.1.0.385.isr3 64bit -- 22 Feb 2016
Copyright (C) 1989-2016 Cadence Design Systems, Inc. All rights reserved worldwide. Cadence, Virtuoso and Spectre are registered trademarks of Cadence Design Systems, Inc. All others are the property of their respective holders.

Includes RSA BSAFE(R) Cryptographic or Security Protocol Software from RSA Security, Inc.

User: root   Host: vlsi   HostID: 7F0100   PID: 11376
Memory  available: 131.3955 MB  physical: 6.0685 GB
Linux   : CentOS Linux release 7.6.1810 (Core) 
CPU Type: Intel(R) Xeon(R) CPU           W3520  @ 2.67GHz
        Socket: Processors [Frequency]
        0:       0 [1596.0],  1 [1596.0],  2 [2128.0],  3 [1729.0]
        
System load averages (1min, 5min, 15min) : 22.2 %, 14.8 %, 15.5 %


Simulating `input.scs' on vlsi at 10:30:31 AM, Wed Feb 6, 2019 (process id: 11376).
Current working directory: /root/simulation/pll_31_dec/spectre/schematic/netlist
Command line:
    /home/user1/cadence/MMSIM151/tools/bin/spectre -64 input.scs  \
        +escchars +log ../psf/spectre.out -format psfxl -raw ../psf  \
        +aps +cktpreset=pll +lqtimeout 900 -maxw 5 -maxn 5

Loading /home/user1/cadence/MMSIM151/tools.lnx86/cmi/lib/64bit/5.0/libinfineon_sh.so ...
Loading /home/user1/cadence/MMSIM151/tools.lnx86/cmi/lib/64bit/5.0/libphilips_o_sh.so ...
Loading /home/user1/cadence/MMSIM151/tools.lnx86/cmi/lib/64bit/5.0/libphilips_sh.so ...
Loading /home/user1/cadence/MMSIM151/tools.lnx86/cmi/lib/64bit/5.0/libsparam_sh.so ...
Loading /home/user1/cadence/MMSIM151/tools.lnx86/cmi/lib/64bit/5.0/libstmodels_sh.so ...
Reading file:  /root/simulation/pll_31_dec/spectre/schematic/netlist/input.scs
Reading file:  /home/user1/cadence/MMSIM151/tools.lnx86/spectre/etc/configs/spectre.cfg
Reading file:  /home/user1/PDKfiles/scl_pdk/design_kit/models/hspice/ts18sl_scl.lib
Time for NDB Parsing: CPU = 175.747 ms, elapsed = 3.02841 s.
Time accumulated: CPU = 233.608 ms, elapsed = 3.02842 s.
Peak resident memory used = 36.6 Mbytes.


The CPU load for active processors is :
        Spectre  0 (20.7 %)      1 (17.9 %)      2 (18.8 %)      3 (21.0 %)
        Other   
Reading link:  /home/user1/cadence/MMSIM151/tools.lnx86/spectre/etc/ahdl/discipline.h
Reading file:  /home/user1/cadence/MMSIM151/tools.lnx86/spectre/etc/ahdl/disciplines.vams
Reading link:  /home/user1/cadence/MMSIM151/tools.lnx86/spectre/etc/ahdl/constants.h
Reading file:  /home/user1/cadence/MMSIM151/tools.lnx86/spectre/etc/ahdl/constants.vams
Time for Elaboration: CPU = 38.544 ms, elapsed = 175.128 ms.
Time accumulated: CPU = 272.609 ms, elapsed = 3.204 s.
Peak resident memory used = 43.2 Mbytes.

Time for EDB Visiting: CPU = 7.112 ms, elapsed = 29.8231 ms.
Time accumulated: CPU = 280.133 ms, elapsed = 3.23424 s.
Peak resident memory used = 44.1 Mbytes.


Warning from spectre during initial setup.
    WARNING (CMI-2419): p18.7: `imax' = 1 A is larger than `imelt' = 1.416 mA.  `imelt' is increased to `imax'.
    WARNING (CMI-2419): n18.4: `imax' = 1 A is larger than `imelt' = 100 mA.  `imelt' is increased to `imax'.
    WARNING (CMI-2419): n18.7: `imax' = 1 A is larger than `imelt' = 100 mA.  `imelt' is increased to `imax'.
Notice from spectre during topology check.
    No DC path from node `net043' to ground, Gmin installed to provide path.
Notice from spectre during initial setup.
    Multithreading is disabled due to the size of the design being too small.


Global user options:
             reltol = 0.001
            vabstol = 3e-05
            iabstol = 1e-11
               temp = 25
               tnom = 27
        multithread = on
             scalem = 1
              scale = 1e-06
               gmin = 1e-12
             rforce = 1
           maxnotes = 5
           maxwarns = 5
             digits = 5
               cols = 80
             pivrel = 0.001
           sensfile = ../psf/sens.output
     checklimitdest = psf
               save = selected

Scoped user options:

Circuit inventory:
              nodes 102
            bsim3v3 170   
          capacitor 3     
           resistor 2     
            vsource 2     

Analysis and control statement inventory:
               info 7     
             pnoise 1     
                pss 1     
               tran 1     

Output statements:
             .probe 0     
           .measure 0     
               save 1     


Notice from spectre during initial setup.
    APS Enabled ( cktpreset=pll ).

Time for parsing: CPU = 7.253 ms, elapsed = 307.457 ms.
Time accumulated: CPU = 287.798 ms, elapsed = 3.5421 s.
Peak resident memory used = 45.4 Mbytes.

~~~~~~~~~~~~~~~~~~~~~~
Pre-Simulation Summary
~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~

Warning from spectre.
    WARNING (SPECTRE-16707): Only tran supports psfxl format, result of other analyses will be in psfbin format.


************************************************
Transient Analysis `tran': time = (0 s -> 10 us)
************************************************

Notice from spectre during IC analysis, during transient analysis `tran'.
    GminDC = 1 pS is large enough to noticeably affect the DC solution.
        dV(I5.net84) = 119.623 mV
        Use the `gmin_check' option to eliminate or expand this report.
    Bad pivoting is found during DC analysis. Option dc_pivot_check=yes is recommended for possible improvement of convergence.

DC simulation time: CPU = 28.698 ms, elapsed = 30.3509 ms.

Opening the PSFXL file ../psf/tran.tran.tran ...
Important parameter values:
    start = 0 s
    outputstart = 0 s
    stop = 10 us
    step = 10 ns
    maxstep = 200 ns
    ic = all
    useprevic = no
    skipdc = no
    reltol = 1e-03
    abstol(V) = 30 uV
    abstol(I) = 10 pA
    temp = 25 C
    tnom = 27 C
    tempeffects = all
    errpreset = moderate
    method = traponly
    lteratio = 3.5
    relref = sigglobal
    cmin = 0 F
    gmin = 1 pS
    rabsshort = 1 mOhm


Notice from spectre during transient analysis `tran'.
    Multithreading is disabled due to the size of the design being too small.


Output and IC/nodeset summary:
                 save   6       (voltage)
                 nodeset        1       

    tran: time = 122.2 ns    (1.22 %), step = 3.874 ps    (38.7 u%)
    tran: time = 247.2 ns    (2.47 %), step = 10.21 ps     (102 u%)
    tran: time = 250 ns       (2.5 %), step = 10.08 ps     (101 u%)
    tran: time = 371.1 ns    (3.71 %), step = 9.163 ps    (91.6 u%)
    tran: time = 490.1 ns     (4.9 %), step = 13.19 ps     (132 u%)
    tran: time = 603.2 ns    (6.03 %), step = 10.71 ps     (107 u%)
    tran: time = 718 ns      (7.18 %), step = 9.304 ps      (93 u%)
    tran: time = 750 ns       (7.5 %), step = 5.669 ps    (56.7 u%)
    tran: time = 863.7 ns    (8.64 %), step = 7.933 ps    (79.3 u%)
    tran: time = 976.7 ns    (9.77 %), step = 12.25 ps     (122 u%)
    tran: time = 1.092 us    (10.9 %), step = 328.3 fs    (3.28 u%)
    tran: time = 1.211 us    (12.1 %), step = 9.735 ps    (97.3 u%)
    tran: time = 1.25 us     (12.5 %), step = 8.052 ps    (80.5 u%)
    tran: time = 1.369 us    (13.7 %), step = 4.86 ps     (48.6 u%)
    tran: time = 1.486 us    (14.9 %), step = 9.689 ps    (96.9 u%)
    tran: time = 1.603 us      (16 %), step = 9.036 ps    (90.4 u%)
    tran: time = 1.721 us    (17.2 %), step = 9.068 ps    (90.7 u%)
    tran: time = 1.75 us     (17.5 %), step = 8.006 ps    (80.1 u%)
    tran: time = 1.866 us    (18.7 %), step = 9.386 ps    (93.9 u%)
    tran: time = 1.983 us    (19.8 %), step = 10.57 ps     (106 u%)
    tran: time = 2.103 us      (21 %), step = 9.555 ps    (95.6 u%)
    tran: time = 2.222 us    (22.2 %), step = 8.266 ps    (82.7 u%)
    tran: time = 2.25 us     (22.5 %), step = 10.79 ps     (108 u%)
    tran: time = 2.368 us    (23.7 %), step = 15.03 ps     (150 u%)
    tran: time = 2.486 us    (24.9 %), step = 10.84 ps     (108 u%)
    tran: time = 2.602 us      (26 %), step = 8.825 ps    (88.3 u%)
    tran: time = 2.717 us    (27.2 %), step = 355.9 fs    (3.56 u%)
    tran: time = 2.75 us     (27.5 %), step = 3.201 ps      (32 u%)
    tran: time = 2.866 us    (28.7 %), step = 8.49 ps     (84.9 u%)
    tran: time = 2.983 us    (29.8 %), step = 7.738 ps    (77.4 u%)
    tran: time = 3.103 us      (31 %), step = 9.102 ps      (91 u%)
    tran: time = 3.221 us    (32.2 %), step = 6.578 ps    (65.8 u%)
    tran: time = 3.25 us     (32.5 %), step = 7.52 ps     (75.2 u%)
    tran: time = 3.367 us    (33.7 %), step = 9.142 ps    (91.4 u%)
    tran: time = 3.484 us    (34.8 %), step = 8.632 ps    (86.3 u%)
    tran: time = 3.603 us      (36 %), step = 8.371 ps    (83.7 u%)
    tran: time = 3.721 us    (37.2 %), step = 9.427 ps    (94.3 u%)
    tran: time = 3.75 us     (37.5 %), step = 6.901 ps      (69 u%)
    tran: time = 3.867 us    (38.7 %), step = 8.545 ps    (85.5 u%)
    tran: time = 3.986 us    (39.9 %), step = 10.94 ps     (109 u%)
    tran: time = 4.105 us    (41.1 %), step = 6.663 ps    (66.6 u%)
    tran: time = 4.224 us    (42.2 %), step = 5.439 ps    (54.4 u%)
    tran: time = 4.25 us     (42.5 %), step = 8.111 ps    (81.1 u%)
    tran: time = 4.368 us    (43.7 %), step = 9.038 ps    (90.4 u%)
    tran: time = 4.483 us    (44.8 %), step = 5.886 ps    (58.9 u%)
    tran: time = 4.599 us      (46 %), step = 6.154 ps    (61.5 u%)
    tran: time = 4.714 us    (47.1 %), step = 7.979 ps    (79.8 u%)
    tran: time = 4.75 us     (47.5 %), step = 5.018 ps    (50.2 u%)
    tran: time = 4.862 us    (48.6 %), step = 10.72 ps     (107 u%)
    tran: time = 4.976 us    (49.8 %), step = 9.596 ps      (96 u%)
    tran: time = 5.092 us    (50.9 %), step = 9.443 ps    (94.4 u%)
    tran: time = 5.209 us    (52.1 %), step = 12.4 ps      (124 u%)
    tran: time = 5.25 us     (52.5 %), step = 5.542 ps    (55.4 u%)
    tran: time = 5.365 us    (53.7 %), step = 8.869 ps    (88.7 u%)
    tran: time = 5.483 us    (54.8 %), step = 5.697 ps      (57 u%)
    tran: time = 5.598 us      (56 %), step = 6.868 ps    (68.7 u%)
    tran: time = 5.714 us    (57.1 %), step = 8.819 ps    (88.2 u%)
    tran: time = 5.75 us     (57.5 %), step = 6.361 ps    (63.6 u%)
    tran: time = 5.866 us    (58.7 %), step = 10.8 ps      (108 u%)
    tran: time = 5.981 us    (59.8 %), step = 8.116 ps    (81.2 u%)
    tran: time = 6.095 us    (60.9 %), step = 8.31 ps     (83.1 u%)
    tran: time = 6.208 us    (62.1 %), step = 9.948 ps    (99.5 u%)
    tran: time = 6.25 us     (62.5 %), step = 3.629 ps    (36.3 u%)
    tran: time = 6.365 us    (63.6 %), step = 8.918 ps    (89.2 u%)
    tran: time = 6.481 us    (64.8 %), step = 11.12 ps     (111 u%)
    tran: time = 6.591 us    (65.9 %), step = 14.74 ps     (147 u%)
    tran: time = 6.705 us    (67.1 %), step = 9.352 ps    (93.5 u%)
    tran: time = 6.75 us     (67.5 %), step = 6.797 ps      (68 u%)
    tran: time = 6.864 us    (68.6 %), step = 5.945 ps    (59.5 u%)
    tran: time = 6.976 us    (69.8 %), step = 7.559 ps    (75.6 u%)
    tran: time = 7.088 us    (70.9 %), step = 13.87 ps     (139 u%)
    tran: time = 7.203 us      (72 %), step = 9.909 ps    (99.1 u%)
    tran: time = 7.25 us     (72.5 %), step = 2.978 ps    (29.8 u%)
    tran: time = 7.362 us    (73.6 %), step = 17.73 ps     (177 u%)
    tran: time = 7.477 us    (74.8 %), step = 10.68 ps     (107 u%)
    tran: time = 7.593 us    (75.9 %), step = 8.442 ps    (84.4 u%)
    tran: time = 7.708 us    (77.1 %), step = 7.819 ps    (78.2 u%)
    tran: time = 7.75 us     (77.5 %), step = 4.985 ps    (49.9 u%)
    tran: time = 7.862 us    (78.6 %), step = 9.538 ps    (95.4 u%)
    tran: time = 7.974 us    (79.7 %), step = 6.821 ps    (68.2 u%)
    tran: time = 8.087 us    (80.9 %), step = 9.422 ps    (94.2 u%)
    tran: time = 8.2 us        (82 %), step = 15.58 ps     (156 u%)
    tran: time = 8.25 us     (82.5 %), step = 5.677 ps    (56.8 u%)
    tran: time = 8.367 us    (83.7 %), step = 8.992 ps    (89.9 u%)
    tran: time = 8.483 us    (84.8 %), step = 4.244 ps    (42.4 u%)
    tran: time = 8.6 us        (86 %), step = 12.44 ps     (124 u%)
    tran: time = 8.714 us    (87.1 %), step = 8.932 ps    (89.3 u%)
    tran: time = 8.75 us     (87.5 %), step = 6.711 ps    (67.1 u%)
    tran: time = 8.865 us    (88.7 %), step = 5.09 ps     (50.9 u%)
    tran: time = 8.981 us    (89.8 %), step = 16.53 ps     (165 u%)
    tran: time = 9.096 us      (91 %), step = 17.4 ps      (174 u%)
    tran: time = 9.213 us    (92.1 %), step = 8.794 ps    (87.9 u%)
    tran: time = 9.25 us     (92.5 %), step = 5.684 ps    (56.8 u%)
    tran: time = 9.367 us    (93.7 %), step = 146.8 fs    (1.47 u%)
    tran: time = 9.485 us    (94.8 %), step = 4.576 ps    (45.8 u%)
    tran: time = 9.6 us        (96 %), step = 4.982 ps    (49.8 u%)
    tran: time = 9.714 us    (97.1 %), step = 9.705 ps      (97 u%)
    tran: time = 9.75 us     (97.5 %), step = 6.421 ps    (64.2 u%)
    tran: time = 9.863 us    (98.6 %), step = 6.117 ps    (61.2 u%)
    tran: time = 9.976 us    (99.8 %), step = 9.38 ps     (93.8 u%)
Number of accepted tran steps =             1128547

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Post-Transient Simulation Summary
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   -   To further speed up simulation, consider
          add ++aps on command line
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


During simulation, the CPU load for active processors is :
        Spectre  0 (36.3 %)      1 (63.2 %)      2 (33.2 %)      3 (19.6 %)
        Other   
Initial condition solution time: CPU = 28.857 ms, elapsed = 38.337 ms.
Intrinsic tran analysis time:    CPU = 863.052 s, elapsed = 863.584 s.
Total time required for tran analysis `tran': CPU = 863.085 s (14m  23.1s), elapsed = 863.733 s (14m  23.7s).
Time accumulated: CPU = 863.548 s (14m  23.5s), elapsed = 867.794 s (14m  27.8s).
Peak resident memory used = 56.9 Mbytes.

finalTimeOP: writing operating point information to rawfile.

Opening the PSF file ../psf/finalTimeOP.info ...

Notice from spectre.
    Multithreading is disabled due to the size of the design being too small.


****************************************************
Periodic Steady-State Analysis `pss': fund = 320 MHz
****************************************************

Notice from spectre during IC analysis, during periodic steady state analysis `pss'.
    GminDC = 1 pS is large enough to noticeably affect the DC solution.
        dV(I5.net84) = 119.623 mV
        Use the `gmin_check' option to eliminate or expand this report.
    Bad pivoting is found during DC analysis. Option dc_pivot_check=yes is recommended for possible improvement of convergence.

DC simulation time: CPU = 43.62 ms, elapsed = 125.192 ms.

=================================
`pss': time = (0 s -> 10.0031 us)
=================================

Opening the PSF file ../psf/pss.tran.pss ...

Output and IC/nodeset summary:
                 save   6       (voltage)
                 nodeset        1       

Important parameter values in tstab integration:
    start = 0 s
    outputstart = 0 s
    stop = 10.0031 us
    period = 3.125 ns
    maxperiods = 20
    step = 10.0031 ns
    maxstep = 125 ps
    ic = all
    useprevic = no
    skipdc = no
    reltol = 1e-03
    abstol(V) = 30 uV
    abstol(I) = 10 pA
    temp = 25 C
    tnom = 27 C
    tempeffects = all
    method = gear2only
    lteratio = 3.5
    relref = sigglobal
    cmin = 0 F
    gmin = 1 pS
    rabsshort = 1 mOhm


Notice from spectre at time = 1 ns during periodic steady state analysis `pss'.
    The value of parameter 'reltol' was set to 0.5 at time 1e-09 s.

    pss: time = 74.34 ns    (743 m%), step = 29.29 ps     (293 u%)
    pss: time = 145 ns      (1.45 %), step = 119.4 ps    (1.19 m%)
    pss: time = 219.8 ns     (2.2 %), step = 62.5 ps      (625 u%)
    pss: time = 250.1 ns     (2.5 %), step = 25.35 ps     (253 u%)
    pss: time = 327.7 ns    (3.28 %), step = 120.1 ps     (1.2 m%)
    pss: time = 399.2 ns    (3.99 %), step = 103.4 ps    (1.03 m%)
    pss: time = 471 ns      (4.71 %), step = 29.6 ps      (296 u%)
    pss: time = 542.3 ns    (5.42 %), step = 13.54 ps     (135 u%)
    pss: time = 613.8 ns    (6.14 %), step = 58.95 ps     (589 u%)
    pss: time = 680.4 ns     (6.8 %), step = 28.44 ps     (284 u%)
    pss: time = 750.3 ns     (7.5 %), step = 60.09 ps     (601 u%)
    pss: time = 820.7 ns     (8.2 %), step = 87.54 ps     (875 u%)
    pss: time = 892.2 ns    (8.92 %), step = 46.43 ps     (464 u%)
    pss: time = 970.3 ns     (9.7 %), step = 61.2 ps      (612 u%)
    pss: time = 1.049 us    (10.5 %), step = 57.04 ps     (570 u%)
    pss: time = 1.114 us    (11.1 %), step = 42.45 ps     (424 u%)
    pss: time = 1.179 us    (11.8 %), step = 29.67 ps     (297 u%)
    pss: time = 1.246 us    (12.5 %), step = 62.5 ps      (625 u%)
    pss: time = 1.25 us     (12.5 %), step = 81.22 ps     (812 u%)
    pss: time = 1.321 us    (13.2 %), step = 125 ps      (1.25 m%)
    pss: time = 1.388 us    (13.9 %), step = 60.65 ps     (606 u%)
    pss: time = 1.454 us    (14.5 %), step = 31.25 ps     (312 u%)
    pss: time = 1.524 us    (15.2 %), step = 82.05 ps     (820 u%)
    pss: time = 1.59 us     (15.9 %), step = 31.25 ps     (312 u%)
    pss: time = 1.659 us    (16.6 %), step = 31.23 ps     (312 u%)
    pss: time = 1.735 us    (17.3 %), step = 50.7 ps      (507 u%)
    pss: time = 1.751 us    (17.5 %), step = 97.4 ps      (974 u%)
    pss: time = 1.825 us    (18.2 %), step = 116.6 ps    (1.17 m%)
    pss: time = 1.891 us    (18.9 %), step = 87.22 ps     (872 u%)
    pss: time = 1.964 us    (19.6 %), step = 18.83 ps     (188 u%)

Notice from spectre at time = 2 us during periodic steady state analysis `pss'.
    The value of parameter 'reltol' was set to 0.1 at time 2e-06 s.

    pss: time = 2.034 us    (20.3 %), step = 43.74 ps     (437 u%)
    pss: time = 2.105 us      (21 %), step = 31.34 ps     (313 u%)
    pss: time = 2.176 us    (21.8 %), step = 13.48 ps     (135 u%)
    pss: time = 2.247 us    (22.5 %), step = 32.02 ps     (320 u%)
    pss: time = 2.251 us    (22.5 %), step = 41.23 ps     (412 u%)
    pss: time = 2.322 us    (23.2 %), step = 10.74 ps     (107 u%)
    pss: time = 2.394 us    (23.9 %), step = 37.25 ps     (372 u%)
    pss: time = 2.467 us    (24.7 %), step = 38.44 ps     (384 u%)
    pss: time = 2.539 us    (25.4 %), step = 44.03 ps     (440 u%)
    pss: time = 2.611 us    (26.1 %), step = 39.27 ps     (393 u%)
    pss: time = 2.684 us    (26.8 %), step = 35.78 ps     (358 u%)
    pss: time = 2.751 us    (27.5 %), step = 40.24 ps     (402 u%)
    pss: time = 2.822 us    (28.2 %), step = 37.34 ps     (373 u%)
    pss: time = 2.893 us    (28.9 %), step = 15.64 ps     (156 u%)
    pss: time = 2.965 us    (29.6 %), step = 38.31 ps     (383 u%)
    pss: time = 3.036 us    (30.4 %), step = 29.57 ps     (296 u%)
    pss: time = 3.106 us    (31.1 %), step = 20.36 ps     (204 u%)
    pss: time = 3.176 us    (31.7 %), step = 22.66 ps     (227 u%)
    pss: time = 3.248 us    (32.5 %), step = 41.63 ps     (416 u%)
    pss: time = 3.251 us    (32.5 %), step = 35.69 ps     (357 u%)
    pss: time = 3.322 us    (33.2 %), step = 29.58 ps     (296 u%)
    pss: time = 3.393 us    (33.9 %), step = 37.93 ps     (379 u%)
    pss: time = 3.465 us    (34.6 %), step = 22.43 ps     (224 u%)
    pss: time = 3.535 us    (35.3 %), step = 34.74 ps     (347 u%)
    pss: time = 3.606 us      (36 %), step = 8.158 ps    (81.6 u%)
    pss: time = 3.675 us    (36.7 %), step = 27.86 ps     (279 u%)
    pss: time = 3.744 us    (37.4 %), step = 29 ps        (290 u%)
    pss: time = 3.751 us    (37.5 %), step = 40.11 ps     (401 u%)
    pss: time = 3.822 us    (38.2 %), step = 37.74 ps     (377 u%)
    pss: time = 3.892 us    (38.9 %), step = 30.68 ps     (307 u%)
    pss: time = 3.963 us    (39.6 %), step = 9.171 ps    (91.7 u%)

Notice from spectre at time = 4 us during periodic steady state analysis `pss'.
    The value of parameter 'reltol' was set to 0.001 at time 4e-06 s.

    pss: time = 4.022 us    (40.2 %), step = 5.055 ps    (50.5 u%)
    pss: time = 4.069 us    (40.7 %), step = 3.003 ps      (30 u%)
    pss: time = 4.116 us    (41.1 %), step = 285.7 fs    (2.86 u%)
    pss: time = 4.163 us    (41.6 %), step = 5.087 ps    (50.9 u%)
    pss: time = 4.211 us    (42.1 %), step = 6.419 ps    (64.2 u%)
    pss: time = 4.251 us    (42.5 %), step = 5.452 ps    (54.5 u%)
    pss: time = 4.299 us      (43 %), step = 5.623 ps    (56.2 u%)
    pss: time = 4.347 us    (43.5 %), step = 2.257 ps    (22.6 u%)
    pss: time = 4.394 us    (43.9 %), step = 7.759 ps    (77.6 u%)
    pss: time = 4.442 us    (44.4 %), step = 4.338 ps    (43.4 u%)
    pss: time = 4.49 us     (44.9 %), step = 5.253 ps    (52.5 u%)
    pss: time = 4.538 us    (45.4 %), step = 5.534 ps    (55.3 u%)
    pss: time = 4.586 us    (45.8 %), step = 4.419 ps    (44.2 u%)
    pss: time = 4.633 us    (46.3 %), step = 7.465 ps    (74.6 u%)
    pss: time = 4.68 us     (46.8 %), step = 3.619 ps    (36.2 u%)
    pss: time = 4.728 us    (47.3 %), step = 179.8 fs     (1.8 u%)
    pss: time = 4.751 us    (47.5 %), step = 6.095 ps    (60.9 u%)
    pss: time = 4.798 us      (48 %), step = 4.794 ps    (47.9 u%)
    pss: time = 4.845 us    (48.4 %), step = 3.431 ps    (34.3 u%)
    pss: time = 4.892 us    (48.9 %), step = 5.419 ps    (54.2 u%)
    pss: time = 4.94 us     (49.4 %), step = 5.173 ps    (51.7 u%)
    pss: time = 4.988 us    (49.9 %), step = 2.928 ps    (29.3 u%)
    pss: time = 5.036 us    (50.3 %), step = 6.079 ps    (60.8 u%)
    pss: time = 5.084 us    (50.8 %), step = 4.113 ps    (41.1 u%)
    pss: time = 5.132 us    (51.3 %), step = 8.044 ps    (80.4 u%)
    pss: time = 5.18 us     (51.8 %), step = 2.903 ps      (29 u%)
    pss: time = 5.228 us    (52.3 %), step = 4.986 ps    (49.8 u%)
    pss: time = 5.252 us    (52.5 %), step = 3.8 ps        (38 u%)
    pss: time = 5.299 us      (53 %), step = 5.123 ps    (51.2 u%)
    pss: time = 5.346 us    (53.4 %), step = 5.193 ps    (51.9 u%)
    pss: time = 5.393 us    (53.9 %), step = 7.345 ps    (73.4 u%)
    pss: time = 5.44 us     (54.4 %), step = 3.885 ps    (38.8 u%)
    pss: time = 5.486 us    (54.8 %), step = 10.59 ps     (106 u%)
    pss: time = 5.534 us    (55.3 %), step = 4.639 ps    (46.4 u%)
    pss: time = 5.582 us    (55.8 %), step = 5.93 ps     (59.3 u%)
    pss: time = 5.629 us    (56.3 %), step = 3.354 ps    (33.5 u%)
    pss: time = 5.675 us    (56.7 %), step = 3.315 ps    (33.1 u%)
    pss: time = 5.722 us    (57.2 %), step = 6.694 ps    (66.9 u%)
    pss: time = 5.752 us    (57.5 %), step = 4.857 ps    (48.6 u%)
    pss: time = 5.798 us      (58 %), step = 282.3 fs    (2.82 u%)
    pss: time = 5.844 us    (58.4 %), step = 5.749 ps    (57.5 u%)
    pss: time = 5.891 us    (58.9 %), step = 4.809 ps    (48.1 u%)
    pss: time = 5.937 us    (59.3 %), step = 5.305 ps      (53 u%)
    pss: time = 5.984 us    (59.8 %), step = 4.225 ps    (42.2 u%)
    pss: time = 6.031 us    (60.3 %), step = 4.698 ps      (47 u%)
    pss: time = 6.079 us    (60.8 %), step = 5.342 ps    (53.4 u%)
    pss: time = 6.127 us    (61.2 %), step = 9.318 ps    (93.1 u%)
    pss: time = 6.173 us    (61.7 %), step = 1.397 ps      (14 u%)
    pss: time = 6.221 us    (62.2 %), step = 3.257 ps    (32.6 u%)
    pss: time = 6.252 us    (62.5 %), step = 5.026 ps    (50.2 u%)
    pss: time = 6.299 us      (63 %), step = 4.665 ps    (46.6 u%)
    pss: time = 6.346 us    (63.4 %), step = 7.413 ps    (74.1 u%)
    pss: time = 6.394 us    (63.9 %), step = 328.3 fs    (3.28 u%)
    pss: time = 6.441 us    (64.4 %), step = 4.312 ps    (43.1 u%)
    pss: time = 6.489 us    (64.9 %), step = 4.612 ps    (46.1 u%)
    pss: time = 6.536 us    (65.3 %), step = 5.803 ps      (58 u%)
    pss: time = 6.584 us    (65.8 %), step = 2.872 ps    (28.7 u%)
    pss: time = 6.631 us    (66.3 %), step = 4.649 ps    (46.5 u%)
    pss: time = 6.679 us    (66.8 %), step = 7.108 ps    (71.1 u%)
    pss: time = 6.726 us    (67.2 %), step = 5.9 ps        (59 u%)
    pss: time = 6.752 us    (67.5 %), step = 6.085 ps    (60.8 u%)
    pss: time = 6.8 us        (68 %), step = 1.967 ps    (19.7 u%)
    pss: time = 6.847 us    (68.4 %), step = 6.134 ps    (61.3 u%)
    pss: time = 6.894 us    (68.9 %), step = 5.191 ps    (51.9 u%)
    pss: time = 6.942 us    (69.4 %), step = 5.793 ps    (57.9 u%)
    pss: time = 6.989 us    (69.9 %), step = 4.067 ps    (40.7 u%)
    pss: time = 7.037 us    (70.3 %), step = 5.476 ps    (54.7 u%)
    pss: time = 7.084 us    (70.8 %), step = 4.991 ps    (49.9 u%)
    pss: time = 7.131 us    (71.3 %), step = 5.781 ps    (57.8 u%)
    pss: time = 7.178 us    (71.8 %), step = 5.134 ps    (51.3 u%)
    pss: time = 7.225 us    (72.2 %), step = 1.987 ps    (19.9 u%)
    pss: time = 7.252 us    (72.5 %), step = 4.67 ps     (46.7 u%)
    pss: time = 7.3 us        (73 %), step = 5.797 ps      (58 u%)
    pss: time = 7.347 us    (73.4 %), step = 4.431 ps    (44.3 u%)
    pss: time = 7.395 us    (73.9 %), step = 4.548 ps    (45.5 u%)
    pss: time = 7.441 us    (74.4 %), step = 2.416 ps    (24.2 u%)
    pss: time = 7.488 us    (74.9 %), step = 5.612 ps    (56.1 u%)
    pss: time = 7.536 us    (75.3 %), step = 3.601 ps      (36 u%)
    pss: time = 7.583 us    (75.8 %), step = 4.541 ps    (45.4 u%)
    pss: time = 7.629 us    (76.3 %), step = 3.279 ps    (32.8 u%)
    pss: time = 7.676 us    (76.7 %), step = 4.378 ps    (43.8 u%)
    pss: time = 7.723 us    (77.2 %), step = 5.111 ps    (51.1 u%)
    pss: time = 7.752 us    (77.5 %), step = 4.853 ps    (48.5 u%)
    pss: time = 7.799 us      (78 %), step = 5.706 ps      (57 u%)
    pss: time = 7.846 us    (78.4 %), step = 4.309 ps    (43.1 u%)
    pss: time = 7.892 us    (78.9 %), step = 2.943 ps    (29.4 u%)
    pss: time = 7.94 us     (79.4 %), step = 3.947 ps    (39.5 u%)
    pss: time = 7.987 us    (79.8 %), step = 6.877 ps    (68.7 u%)
    pss: time = 8.034 us    (80.3 %), step = 4.647 ps    (46.5 u%)
    pss: time = 8.081 us    (80.8 %), step = 7.079 ps    (70.8 u%)
    pss: time = 8.129 us    (81.3 %), step = 5.769 ps    (57.7 u%)
    pss: time = 8.176 us    (81.7 %), step = 5.487 ps    (54.9 u%)
    pss: time = 8.224 us    (82.2 %), step = 2.839 ps    (28.4 u%)
    pss: time = 8.253 us    (82.5 %), step = 5.509 ps    (55.1 u%)
    pss: time = 8.3 us        (83 %), step = 58.37 fs     (584 n%)
    pss: time = 8.348 us    (83.4 %), step = 5.345 ps    (53.4 u%)
    pss: time = 8.395 us    (83.9 %), step = 5.264 ps    (52.6 u%)
    pss: time = 8.442 us    (84.4 %), step = 2.651 ps    (26.5 u%)
    pss: time = 8.489 us    (84.9 %), step = 2.224 ps    (22.2 u%)
    pss: time = 8.538 us    (85.4 %), step = 5.932 ps    (59.3 u%)
    pss: time = 8.587 us    (85.8 %), step = 7.239 ps    (72.4 u%)
    pss: time = 8.635 us    (86.3 %), step = 4.517 ps    (45.2 u%)
    pss: time = 8.683 us    (86.8 %), step = 4.308 ps    (43.1 u%)
    pss: time = 8.731 us    (87.3 %), step = 2.982 ps    (29.8 u%)
    pss: time = 8.753 us    (87.5 %), step = 5.094 ps    (50.9 u%)
    pss: time = 8.8 us        (88 %), step = 5.572 ps    (55.7 u%)
    pss: time = 8.847 us    (88.4 %), step = 3.937 ps    (39.4 u%)
    pss: time = 8.894 us    (88.9 %), step = 4.708 ps    (47.1 u%)
    pss: time = 8.942 us    (89.4 %), step = 4.266 ps    (42.6 u%)
    pss: time = 8.989 us    (89.9 %), step = 5.455 ps    (54.5 u%)
    pss: time = 9.036 us    (90.3 %), step = 5.688 ps    (56.9 u%)
    pss: time = 9.083 us    (90.8 %), step = 5.892 ps    (58.9 u%)
    pss: time = 9.129 us    (91.3 %), step = 3.27 ps     (32.7 u%)
    pss: time = 9.176 us    (91.7 %), step = 6.104 ps      (61 u%)
    pss: time = 9.223 us    (92.2 %), step = 5.916 ps    (59.1 u%)
    pss: time = 9.253 us    (92.5 %), step = 5.233 ps    (52.3 u%)
    pss: time = 9.3 us        (93 %), step = 1.121 ps    (11.2 u%)
    pss: time = 9.348 us    (93.4 %), step = 3.872 ps    (38.7 u%)
    pss: time = 9.396 us    (93.9 %), step = 4.743 ps    (47.4 u%)
    pss: time = 9.443 us    (94.4 %), step = 5.221 ps    (52.2 u%)
    pss: time = 9.491 us    (94.9 %), step = 9.464 ps    (94.6 u%)
    pss: time = 9.538 us    (95.3 %), step = 4.029 ps    (40.3 u%)
    pss: time = 9.585 us    (95.8 %), step = 4.993 ps    (49.9 u%)
    pss: time = 9.633 us    (96.3 %), step = 5.112 ps    (51.1 u%)
    pss: time = 9.681 us    (96.8 %), step = 1.884 ps    (18.8 u%)
    pss: time = 9.728 us    (97.3 %), step = 3.074 ps    (30.7 u%)
    pss: time = 9.753 us    (97.5 %), step = 4.556 ps    (45.5 u%)
    pss: time = 9.801 us      (98 %), step = 6.4 ps        (64 u%)
    pss: time = 9.849 us    (98.5 %), step = 4.037 ps    (40.4 u%)
    pss: time = 9.897 us    (98.9 %), step = 5.108 ps    (51.1 u%)
    pss: time = 9.945 us    (99.4 %), step = 4.539 ps    (45.4 u%)
    pss: time = 9.991 us    (99.9 %), step = 4.18 ps     (41.8 u%)

Notice from spectre during periodic steady state analysis `pss'.
    The value of parameter 'reltol' was set to 0.001 at time 1.00031e-05 s.

Total time required for tstab analysis `pss': CPU = 2.69682 ks (44m  56.8s), elapsed = 2.70437 ks (45m  4.4s).
Time accumulated: CPU = 2.69682 ks (44m  56.8s), elapsed = 2.70439 ks (45m  4.4s).
Peak resident memory used = 56.9 Mbytes.

Conv norm = 17.5e+03, max dV(I1.net243) = 1.03818 V, took 1.83318 ks.

Important parameter values in pss iteration:
    start = 10 us
    outputstart = 0 s
    stop = 10.0031 us
    period = 3.125 ns
    maxperiods = 20
    steadyratio = 1e-03
    step = 10.0031 ns
    maxstep = 15.625 ps
    ic = all
    useprevic = no
    skipdc = no
    reltol = 1e-03
    abstol(V) = 30 uV
    abstol(I) = 10 pA
    temp = 25 C
    tnom = 27 C
    tempeffects = all
    errpreset = moderate
    method = gear2only
    lteratio = 3.5
    relref = alllocal
    cmin = 0 F
    gmin = 1 pS
    rabsshort = 1 mOhm


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us       (2.57 %), step = 4.206 ps     (135 m%)
    pss: time = 10 us       (7.58 %), step = 4.672 ps     (149 m%)
    pss: time = 10 us       (12.6 %), step = 6.655 ps     (213 m%)
    pss: time = 10 us       (17.6 %), step = 6.283 ps     (201 m%)
    pss: time = 10 us       (22.6 %), step = 4.001 ps     (128 m%)
    pss: time = 10 us       (27.6 %), step = 4.231 ps     (135 m%)
    pss: time = 10 us       (32.5 %), step = 1.62 ps     (51.8 m%)
    pss: time = 10 us       (37.6 %), step = 7.749 ps     (248 m%)
    pss: time = 10 us       (42.5 %), step = 6.369 ps     (204 m%)
    pss: time = 10 us       (47.6 %), step = 3.606 ps     (115 m%)
    pss: time = 10 us       (52.6 %), step = 4.216 ps     (135 m%)
    pss: time = 10 us       (57.6 %), step = 4.165 ps     (133 m%)
    pss: time = 10 us       (62.7 %), step = 8.236 ps     (264 m%)
    pss: time = 10 us       (67.6 %), step = 3.972 ps     (127 m%)
    pss: time = 10 us       (72.6 %), step = 4.474 ps     (143 m%)
    pss: time = 10 us       (77.6 %), step = 4.833 ps     (155 m%)
    pss: time = 10 us       (82.5 %), step = 1.71 ps     (54.7 m%)
    pss: time = 10 us       (87.6 %), step = 2.908 ps      (93 m%)
    pss: time = 10 us       (92.5 %), step = 4.036 ps     (129 m%)
    pss: time = 10 us       (97.6 %), step = 3.774 ps     (121 m%)
Conv norm = 2.16e+03, max dV(fout) = 128.594 mV, took 1.34 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================

Warning from spectre at time = 10 us during periodic steady state analysis `pss'.
    WARNING (CMI-2139): I4.M5: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I4.M5: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M45: The bulk-source junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I1.M45: The bulk-source junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M45: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I1.M45: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M43: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I1.M43: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M56: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
        Further occurrences of this warning will be suppressed.
    WARNING (CMI-2144): I1.M56: The bulk-drain junction current exceeds `imax'.
        Further occurrences of this warning will be suppressed.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I4.M5: The bulk-drain junction leaves the linearized region.
    I4.M5: The bulk-drain junction current no longer exceeds `imax'.
    I3.M4: The bulk-drain junction leaves the linearized region.
    I3.M4: The bulk-drain junction current no longer exceeds `imax'.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I1.M45: The bulk-source junction leaves the linearized region.
    I1.M45: The bulk-source junction current no longer exceeds `imax'.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I1.M55: The bulk-drain junction leaves the linearized region.
    I1.M55: The bulk-drain junction current no longer exceeds `imax'.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I1.M56: The bulk-drain junction leaves the linearized region.
        Further occurrences of this notice will be suppressed.
    I1.M56: The bulk-drain junction current no longer exceeds `imax'.
        Further occurrences of this notice will be suppressed.

    pss: time = 10 us       (2.64 %), step = 5.885 ps     (188 m%)
    pss: time = 10 us       (7.54 %), step = 4.077 ps     (130 m%)
    pss: time = 10 us       (12.6 %), step = 4.149 ps     (133 m%)
    pss: time = 10 us       (17.5 %), step = 3.873 ps     (124 m%)
    pss: time = 10 us       (22.5 %), step = 4.361 ps     (140 m%)
    pss: time = 10 us       (27.7 %), step = 7.22 ps      (231 m%)
    pss: time = 10 us       (32.5 %), step = 4.71 ps      (151 m%)
    pss: time = 10 us       (37.6 %), step = 4.146 ps     (133 m%)
    pss: time = 10 us       (42.5 %), step = 3.403 ps     (109 m%)
    pss: time = 10 us       (47.6 %), step = 5.835 ps     (187 m%)
    pss: time = 10 us       (52.6 %), step = 4.479 ps     (143 m%)
    pss: time = 10 us       (57.6 %), step = 3.404 ps     (109 m%)
    pss: time = 10 us       (62.5 %), step = 4.016 ps     (129 m%)
    pss: time = 10 us       (67.6 %), step = 3.435 ps     (110 m%)
    pss: time = 10 us       (72.6 %), step = 3.902 ps     (125 m%)
    pss: time = 10 us       (77.6 %), step = 3.25 ps      (104 m%)
    pss: time = 10 us       (82.5 %), step = 4.521 ps     (145 m%)
    pss: time = 10 us       (87.5 %), step = 3.264 ps     (104 m%)
    pss: time = 10 us       (92.6 %), step = 4.006 ps     (128 m%)
    pss: time = 10 us       (97.6 %), step = 4.347 ps     (139 m%)
Conv norm = 79.4e+03, max dV(I1.net243) = 10.5228 V, took 1.37 s.


Notice from spectre during periodic steady state analysis `pss'.
    10 warnings suppressed.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us       (2.64 %), step = 5.885 ps     (188 m%)
    pss: time = 10 us       (7.51 %), step = 5.916 ps     (189 m%)
    pss: time = 10 us       (12.5 %), step = 4.756 ps     (152 m%)
    pss: time = 10 us       (17.5 %), step = 1.66 ps     (53.1 m%)
    pss: time = 10 us       (22.6 %), step = 3.751 ps     (120 m%)
    pss: time = 10 us       (27.5 %), step = 3.733 ps     (119 m%)
    pss: time = 10 us       (32.5 %), step = 5.138 ps     (164 m%)
    pss: time = 10 us       (37.6 %), step = 4.276 ps     (137 m%)
    pss: time = 10 us       (42.5 %), step = 3.317 ps     (106 m%)
    pss: time = 10 us       (47.5 %), step = 4.211 ps     (135 m%)
    pss: time = 10 us       (52.5 %), step = 3.944 ps     (126 m%)
    pss: time = 10 us       (57.5 %), step = 3.82 ps      (122 m%)
    pss: time = 10 us       (62.6 %), step = 3.904 ps     (125 m%)
    pss: time = 10 us       (67.6 %), step = 5.453 ps     (174 m%)
    pss: time = 10 us       (72.5 %), step = 6.372 ps     (204 m%)
    pss: time = 10 us       (77.6 %), step = 4.333 ps     (139 m%)
    pss: time = 10 us       (82.6 %), step = 3.937 ps     (126 m%)
    pss: time = 10 us       (87.6 %), step = 3.45 ps      (110 m%)
    pss: time = 10 us       (92.6 %), step = 5.76 ps      (184 m%)
    pss: time = 10 us       (97.7 %), step = 5.405 ps     (173 m%)
Conv norm = 32.9e+03, max dV(I3.net75) = 1.81126 V, took 1.35 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================

Warning from spectre at time = 10 us during periodic steady state analysis `pss'.
    WARNING (CMI-2139): M22: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): M22: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): M2: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): M2: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I3.M5: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I3.M5: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M45: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I1.M45: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M44: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
        Further occurrences of this warning will be suppressed.
    WARNING (CMI-2144): I1.M44: The bulk-drain junction current exceeds `imax'.
        Further occurrences of this warning will be suppressed.

    pss: time = 10 us       (2.58 %), step = 6.734 ps     (215 m%)
    pss: time = 10 us       (7.51 %), step = 3.789 ps     (121 m%)
    pss: time = 10 us       (12.6 %), step = 4.234 ps     (135 m%)
    pss: time = 10 us       (17.6 %), step = 4.582 ps     (147 m%)
    pss: time = 10 us       (22.5 %), step = 3.739 ps     (120 m%)
    pss: time = 10 us       (27.5 %), step = 3.65 ps      (117 m%)
    pss: time = 10 us       (32.6 %), step = 4.329 ps     (139 m%)
    pss: time = 10 us       (37.7 %), step = 5.841 ps     (187 m%)
    pss: time = 10 us       (42.6 %), step = 7.154 ps     (229 m%)
    pss: time = 10 us       (47.6 %), step = 4.268 ps     (137 m%)
    pss: time = 10 us       (52.6 %), step = 4.264 ps     (136 m%)
    pss: time = 10 us       (57.5 %), step = 3.383 ps     (108 m%)
    pss: time = 10 us       (62.6 %), step = 3.892 ps     (125 m%)
    pss: time = 10 us       (67.5 %), step = 3.133 ps     (100 m%)
    pss: time = 10 us       (72.5 %), step = 5.419 ps     (173 m%)
    pss: time = 10 us       (77.6 %), step = 4.261 ps     (136 m%)
    pss: time = 10 us       (82.6 %), step = 2.429 ps    (77.7 m%)
    pss: time = 10 us       (87.6 %), step = 4.569 ps     (146 m%)
    pss: time = 10 us       (92.5 %), step = 3.899 ps     (125 m%)
    pss: time = 10 us       (97.6 %), step = 4.036 ps     (129 m%)
Conv norm = 96.4e+03, max dV(I1.net248) = 18.615 V, took 2.73 s.


Notice from spectre during periodic steady state analysis `pss'.
    6 warnings suppressed.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us        (2.5 %), step = 4.362 ps     (140 m%)
    pss: time = 10 us       (7.61 %), step = 4.255 ps     (136 m%)
    pss: time = 10 us       (12.6 %), step = 6.143 ps     (197 m%)
    pss: time = 10 us       (17.6 %), step = 3.537 ps     (113 m%)
    pss: time = 10 us       (22.6 %), step = 3.755 ps     (120 m%)
    pss: time = 10 us       (27.6 %), step = 4.036 ps     (129 m%)
    pss: time = 10 us       (32.6 %), step = 4.19 ps      (134 m%)
    pss: time = 10 us       (37.6 %), step = 3.304 ps     (106 m%)
    pss: time = 10 us       (42.7 %), step = 5.512 ps     (176 m%)
    pss: time = 10 us       (47.6 %), step = 4.746 ps     (152 m%)
    pss: time = 10 us       (52.5 %), step = 2.199 ps    (70.4 m%)
    pss: time = 10 us       (57.5 %), step = 3.605 ps     (115 m%)
    pss: time = 10 us       (62.5 %), step = 4.163 ps     (133 m%)
    pss: time = 10 us       (67.5 %), step = 2.374 ps      (76 m%)
    pss: time = 10 us       (72.6 %), step = 3.308 ps     (106 m%)
    pss: time = 10 us       (77.6 %), step = 5.378 ps     (172 m%)
    pss: time = 10 us       (82.6 %), step = 6.139 ps     (196 m%)
    pss: time = 10 us       (87.5 %), step = 3.508 ps     (112 m%)
    pss: time = 10 us       (92.5 %), step = 3.754 ps     (120 m%)
    pss: time = 10 us       (97.6 %), step = 3.714 ps     (119 m%)
Conv norm = 34.6e+03, max dV(net128) = 1.86689 V, took 2.69 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us        (2.5 %), step = 4.362 ps     (140 m%)
    pss: time = 10 us       (7.54 %), step = 1.932 ps    (61.8 m%)
    pss: time = 10 us       (12.6 %), step = 5.494 ps     (176 m%)
    pss: time = 10 us       (17.5 %), step = 4.733 ps     (151 m%)
    pss: time = 10 us       (22.5 %), step = 1.567 ps    (50.2 m%)
    pss: time = 10 us       (27.6 %), step = 3.805 ps     (122 m%)
    pss: time = 10 us       (32.6 %), step = 4.313 ps     (138 m%)
    pss: time = 10 us       (37.5 %), step = 4.174 ps     (134 m%)
    pss: time = 10 us       (42.5 %), step = 3.316 ps     (106 m%)
    pss: time = 10 us       (47.6 %), step = 4.952 ps     (158 m%)
    pss: time = 10 us       (52.5 %), step = 4.243 ps     (136 m%)
    pss: time = 10 us       (57.6 %), step = 3.462 ps     (111 m%)
    pss: time = 10 us       (62.5 %), step = 3.411 ps     (109 m%)
    pss: time = 10 us       (67.5 %), step = 4.657 ps     (149 m%)
    pss: time = 10 us       (72.5 %), step = 4.19 ps      (134 m%)
    pss: time = 10 us       (77.5 %), step = 3.303 ps     (106 m%)
    pss: time = 10 us       (82.6 %), step = 5.509 ps     (176 m%)
    pss: time = 10 us       (87.6 %), step = 4.758 ps     (152 m%)
    pss: time = 10 us       (92.5 %), step = 1.575 ps    (50.4 m%)
    pss: time = 10 us       (97.5 %), step = 3.336 ps     (107 m%)
Conv norm = 35.4e+03, max dV(net130) = 1.90548 V, took 2.65 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us        (2.5 %), step = 4.362 ps     (140 m%)
    pss: time = 10 us       (7.54 %), step = 1.932 ps    (61.8 m%)
    pss: time = 10 us       (12.6 %), step = 5.494 ps     (176 m%)
    pss: time = 10 us       (17.6 %), step = 5.419 ps     (173 m%)
    pss: time = 10 us       (22.5 %), step = 6.116 ps     (196 m%)
    pss: time = 10 us       (27.5 %), step = 3.525 ps     (113 m%)
    pss: time = 10 us       (32.5 %), step = 3.753 ps     (120 m%)
    pss: time = 10 us       (37.5 %), step = 3.875 ps     (124 m%)
    pss: time = 10 us       (42.5 %), step = 4.196 ps     (134 m%)
    pss: time = 10 us       (47.5 %), step = 3.286 ps     (105 m%)
    pss: time = 10 us       (52.5 %), step = 3.879 ps     (124 m%)
    pss: time = 10 us       (57.6 %), step = 4.749 ps     (152 m%)
    pss: time = 10 us       (62.5 %), step = 1.833 ps    (58.7 m%)
    pss: time = 10 us       (67.6 %), step = 3.806 ps     (122 m%)
    pss: time = 10 us       (72.6 %), step = 4.293 ps     (137 m%)
    pss: time = 10 us       (77.6 %), step = 4.173 ps     (134 m%)
    pss: time = 10 us       (82.5 %), step = 3.316 ps     (106 m%)
    pss: time = 10 us       (87.6 %), step = 4.437 ps     (142 m%)
    pss: time = 10 us       (92.6 %), step = 6.051 ps     (194 m%)
    pss: time = 10 us       (97.5 %), step = 3.538 ps     (113 m%)
Conv norm = 33.8e+03, max dV(I2.net75) = 1.83375 V, took 2.69 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us        (2.5 %), step = 4.362 ps     (140 m%)
    pss: time = 10 us       (7.54 %), step = 1.932 ps    (61.8 m%)
    pss: time = 10 us       (12.6 %), step = 4.484 ps     (143 m%)
    pss: time = 10 us       (17.6 %), step = 3.762 ps     (120 m%)
    pss: time = 10 us       (22.6 %), step = 5.399 ps     (173 m%)
    pss: time = 10 us       (27.6 %), step = 5.087 ps     (163 m%)
    pss: time = 10 us       (32.5 %), step = 2.889 ps    (92.5 m%)
    pss: time = 10 us       (37.6 %), step = 3.274 ps     (105 m%)
    pss: time = 10 us       (42.5 %), step = 3.924 ps     (126 m%)
    pss: time = 10 us       (47.6 %), step = 4.479 ps     (143 m%)
    pss: time = 10 us       (52.6 %), step = 4.714 ps     (151 m%)
    pss: time = 10 us       (57.5 %), step = 4.914 ps     (157 m%)
    pss: time = 10 us       (62.6 %), step = 5.167 ps     (165 m%)
    pss: time = 10 us       (67.6 %), step = 3.473 ps     (111 m%)
    pss: time = 10 us       (72.6 %), step = 3.299 ps     (106 m%)
    pss: time = 10 us       (77.6 %), step = 4.016 ps     (129 m%)
    pss: time = 10 us       (82.7 %), step = 5.006 ps     (160 m%)
    pss: time = 10 us       (87.5 %), step = 1.495 ps    (47.8 m%)
    pss: time = 10 us       (92.5 %), step = 5.483 ps     (175 m%)
    pss: time = 10 us       (97.6 %), step = 5.087 ps     (163 m%)
Conv norm = 34.7e+03, max dV(net028) = 1.87132 V, took 2.69 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us       (2.55 %), step = 2.347 ps    (75.1 m%)
    pss: time = 10 us       (7.63 %), step = 4.462 ps     (143 m%)
    pss: time = 10 us       (12.6 %), step = 4.328 ps     (138 m%)
    pss: time = 10 us       (17.5 %), step = 4.577 ps     (146 m%)
    pss: time = 10 us       (22.6 %), step = 4.203 ps     (135 m%)
    pss: time = 10 us       (27.6 %), step = 5.457 ps     (175 m%)
    pss: time = 10 us       (32.5 %), step = 4.396 ps     (141 m%)
    pss: time = 10 us       (37.6 %), step = 4.098 ps     (131 m%)
    pss: time = 10 us       (42.5 %), step = 4.065 ps     (130 m%)
    pss: time = 10 us       (47.6 %), step = 4.557 ps     (146 m%)
    pss: time = 10 us       (52.5 %), step = 3.968 ps     (127 m%)
    pss: time = 10 us       (57.6 %), step = 3.844 ps     (123 m%)
    pss: time = 10 us       (62.6 %), step = 5.301 ps     (170 m%)
    pss: time = 10 us       (67.5 %), step = 4.972 ps     (159 m%)
    pss: time = 10 us       (72.6 %), step = 2.229 ps    (71.3 m%)
    pss: time = 10 us       (77.6 %), step = 4.078 ps     (130 m%)
    pss: time = 10 us       (82.6 %), step = 4.266 ps     (137 m%)
    pss: time = 10 us       (87.5 %), step = 4.575 ps     (146 m%)
    pss: time = 10 us       (92.5 %), step = 4.35 ps      (139 m%)
    pss: time = 10 us       (97.7 %), step = 5.505 ps     (176 m%)
Conv norm = 34.5e+03, max dV(I2.net78) = 1.86939 V, took 2.64 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================

Warning from spectre at time = 10 us during periodic steady state analysis `pss'.
    WARNING (CMI-2139): M22: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): M22: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M45: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I1.M45: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M44: The bulk-source junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I1.M44: The bulk-source junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M54: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I1.M54: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M53: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
        Further occurrences of this warning will be suppressed.
    WARNING (CMI-2144): I1.M53: The bulk-drain junction current exceeds `imax'.
        Further occurrences of this warning will be suppressed.

    pss: time = 10 us       (2.55 %), step = 2.347 ps    (75.1 m%)
    pss: time = 10 us       (7.51 %), step = 5.511 ps     (176 m%)
    pss: time = 10 us       (12.7 %), step = 5.246 ps     (168 m%)
    pss: time = 10 us       (17.5 %), step = 5.734 ps     (183 m%)
    pss: time = 10 us       (22.6 %), step = 5.576 ps     (178 m%)
    pss: time = 10 us       (27.6 %), step = 2.545 ps    (81.5 m%)
    pss: time = 10 us       (32.6 %), step = 5.224 ps     (167 m%)
    pss: time = 10 us       (37.5 %), step = 5.613 ps     (180 m%)
    pss: time = 10 us       (42.6 %), step = 4.095 ps     (131 m%)
    pss: time = 10 us       (47.6 %), step = 8.016 ps     (256 m%)
    pss: time = 10 us       (52.5 %), step = 3.937 ps     (126 m%)
    pss: time = 10 us       (57.6 %), step = 4.429 ps     (142 m%)
    pss: time = 10 us       (62.6 %), step = 6.11 ps      (196 m%)
    pss: time = 10 us       (67.6 %), step = 4.745 ps     (152 m%)
    pss: time = 10 us       (72.6 %), step = 3.783 ps     (121 m%)
    pss: time = 10 us       (77.6 %), step = 4.475 ps     (143 m%)
    pss: time = 10 us       (82.5 %), step = 5.811 ps     (186 m%)
    pss: time = 10 us       (87.6 %), step = 5.673 ps     (182 m%)
    pss: time = 10 us       (92.5 %), step = 3.583 ps     (115 m%)
    pss: time = 10 us       (97.7 %), step = 6.218 ps     (199 m%)
Conv norm = 77.6e+03, max dV(net028) = 9.17956 V, took 2.47 s.


Notice from spectre during periodic steady state analysis `pss'.
    8 warnings suppressed.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================

Warning from spectre at time = 10 us during periodic steady state analysis `pss'.
    WARNING (CMI-2139): M22: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): M22: The bulk-drain junction current exceeds `imax'.

    pss: time = 10 us       (2.55 %), step = 2.347 ps    (75.1 m%)
    pss: time = 10 us       (7.66 %), step = 5.747 ps     (184 m%)
    pss: time = 10 us       (12.6 %), step = 4.812 ps     (154 m%)
    pss: time = 10 us       (17.6 %), step = 4.4 ps       (141 m%)
    pss: time = 10 us       (22.5 %), step = 5.469 ps     (175 m%)
    pss: time = 10 us       (27.5 %), step = 3.975 ps     (127 m%)
    pss: time = 10 us       (32.5 %), step = 6.485 ps     (208 m%)
    pss: time = 10 us       (37.5 %), step = 5.826 ps     (186 m%)
    pss: time = 10 us       (42.7 %), step = 5.867 ps     (188 m%)
    pss: time = 10 us       (47.7 %), step = 9.051 ps     (290 m%)
    pss: time = 10 us       (52.5 %), step = 4.268 ps     (137 m%)
    pss: time = 10 us       (57.5 %), step = 3.888 ps     (124 m%)
    pss: time = 10 us       (62.7 %), step = 7.786 ps     (249 m%)
    pss: time = 10 us       (67.6 %), step = 4.438 ps     (142 m%)
    pss: time = 10 us       (72.6 %), step = 3.026 ps    (96.8 m%)
    pss: time = 10 us       (77.6 %), step = 4.783 ps     (153 m%)
    pss: time = 10 us       (82.5 %), step = 4.204 ps     (135 m%)
    pss: time = 10 us       (87.6 %), step = 5.568 ps     (178 m%)
    pss: time = 10 us       (92.6 %), step = 4.06 ps      (130 m%)
    pss: time = 10 us       (97.6 %), step = 6.572 ps     (210 m%)
Conv norm = 35.2e+03, max dV(net132) = -3.45759 V, took 2.46 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================

Warning from spectre at time = 10 us during periodic steady state analysis `pss'.
    WARNING (CMI-2377): M22: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2139): M21: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): M21: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2377): M21: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2139): M3: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): M3: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I2.M5: The bulk-source junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I2.M5: The bulk-source junction current exceeds `imax'.
    WARNING (CMI-2375): I2.M5: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2377): I2.M5: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2139): I2.M6: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I2.M6: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I2.M7: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
        Further occurrences of this warning will be suppressed.
    WARNING (CMI-2144): I2.M7: The bulk-drain junction current exceeds `imax'.
        Further occurrences of this warning will be suppressed.
    WARNING (CMI-2375): I2.M7: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2377): I2.M7: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2377): I1.M46: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
        Further occurrences of this warning will be suppressed.
    WARNING (CMI-2375): I1.M44: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2375): I2.M1: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2375): I2.M4: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
        Further occurrences of this warning will be suppressed.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I1.M46: Device leaves the gate-drain oxide breakdown region.
    I1.M37: Device leaves the gate-drain oxide breakdown region.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    M22: Device leaves the gate-drain oxide breakdown region.
    M20: Device leaves the gate-drain oxide breakdown region.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I1.M44: Device leaves the gate-source oxide breakdown region.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I2.M7: Device leaves the gate-drain oxide breakdown region.
        Further occurrences of this notice will be suppressed.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I2.M5: Device leaves the gate-source oxide breakdown region.
    I2.M7: Device leaves the gate-source oxide breakdown region.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I2.M1: Device leaves the gate-source oxide breakdown region.
Notice from spectre at time = 10 us during periodic steady state analysis `pss'.
    I2.M4: Device leaves the gate-source oxide breakdown region.
        Further occurrences of this notice will be suppressed.

    pss: time = 10 us       (2.61 %), step = 5.113 ps     (164 m%)
    pss: time = 10 us       (7.55 %), step = 6.563 ps     (210 m%)
    pss: time = 10 us       (12.6 %), step = 4.92 ps      (157 m%)
    pss: time = 10 us       (17.5 %), step = 2.542 ps    (81.4 m%)
    pss: time = 10 us       (22.6 %), step = 5.177 ps     (166 m%)
    pss: time = 10 us       (27.6 %), step = 4.856 ps     (155 m%)
    pss: time = 10 us       (32.7 %), step = 5.412 ps     (173 m%)
    pss: time = 10 us       (37.6 %), step = 5.107 ps     (163 m%)
    pss: time = 10 us       (42.6 %), step = 5.4 ps       (173 m%)
    pss: time = 10 us       (47.7 %), step = 7.401 ps     (237 m%)
    pss: time = 10 us       (52.6 %), step = 3.615 ps     (116 m%)
    pss: time = 10 us       (57.5 %), step = 4.814 ps     (154 m%)
    pss: time = 10 us       (62.5 %), step = 4.237 ps     (136 m%)
    pss: time = 10 us       (67.6 %), step = 3.836 ps     (123 m%)
    pss: time = 10 us       (72.6 %), step = 6.429 ps     (206 m%)
    pss: time = 10 us       (77.7 %), step = 6.69 ps      (214 m%)
    pss: time = 10 us       (82.6 %), step = 4.862 ps     (156 m%)
    pss: time = 10 us       (87.5 %), step = 5.791 ps     (185 m%)
    pss: time = 10 us       (92.6 %), step = 4.322 ps     (138 m%)
    pss: time = 10 us       (97.5 %), step = 2.448 ps    (78.3 m%)
Conv norm = 98e+03, max dV(net028) = -31.5356 V, took 1.27 s.


Notice from spectre during periodic steady state analysis `pss'.
    39 warnings suppressed.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================

Warning from spectre at time = 10 us during periodic steady state analysis `pss'.
    WARNING (CMI-2139): I2.M0: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I2.M0: The bulk-drain junction current exceeds `imax'.

    pss: time = 10 us       (2.52 %), step = 5.659 ps     (181 m%)
    pss: time = 10 us        (7.6 %), step = 4.378 ps     (140 m%)
    pss: time = 10 us       (12.6 %), step = 4.994 ps     (160 m%)
    pss: time = 10 us       (17.5 %), step = 4.907 ps     (157 m%)
    pss: time = 10 us       (22.6 %), step = 6.39 ps      (204 m%)
    pss: time = 10 us       (27.6 %), step = 6.993 ps     (224 m%)
    pss: time = 10 us       (32.6 %), step = 6.315 ps     (202 m%)
    pss: time = 10 us       (37.7 %), step = 8.754 ps     (280 m%)
    pss: time = 10 us       (42.6 %), step = 4.312 ps     (138 m%)
    pss: time = 10 us       (47.6 %), step = 3.848 ps     (123 m%)
    pss: time = 10 us       (52.5 %), step = 2.779 ps    (88.9 m%)
    pss: time = 10 us       (57.6 %), step = 5.755 ps     (184 m%)
    pss: time = 10 us       (62.5 %), step = 4.408 ps     (141 m%)
    pss: time = 10 us       (67.5 %), step = 5.48 ps      (175 m%)
    pss: time = 10 us       (72.6 %), step = 4.905 ps     (157 m%)
    pss: time = 10 us       (77.5 %), step = 4.066 ps     (130 m%)
    pss: time = 10 us       (82.5 %), step = 3.443 ps     (110 m%)
    pss: time = 10 us       (87.7 %), step = 6.048 ps     (194 m%)
    pss: time = 10 us       (92.6 %), step = 4.757 ps     (152 m%)
    pss: time = 10 us       (97.6 %), step = 4.146 ps     (133 m%)
Conv norm = 60.1e+03, max dV(I2.net75) = 4.29581 V, took 1.19 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================

Warning from spectre at time = 10 us during periodic steady state analysis `pss'.
    WARNING (CMI-2139): M2: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): M2: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2375): M2: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2377): M2: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2139): I2.M5: The bulk-source junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I2.M5: The bulk-source junction current exceeds `imax'.
    WARNING (CMI-2139): I2.M5: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I2.M5: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I2.M6: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I2.M6: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I2.M7: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
        Further occurrences of this warning will be suppressed.
    WARNING (CMI-2144): I2.M7: The bulk-drain junction current exceeds `imax'.
        Further occurrences of this warning will be suppressed.
    WARNING (CMI-2377): I1.M45: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2377): I1.M44: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2377): I1.M43: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2375): I1.M42: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2377): I1.M42: Vgd has exceeded the oxide breakdown voltage of `vbox' = 12 V.
        Further occurrences of this warning will be suppressed.
    WARNING (CMI-2375): M0: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2375): I1.M34: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
    WARNING (CMI-2375): I1.M33: Vgs has exceeded the oxide breakdown voltage of `vbox' = 12 V.
        Further occurrences of this warning will be suppressed.

    pss: time = 10 us       (2.53 %), step = 1.121 ps    (35.9 m%)
    pss: time = 10 us       (7.57 %), step = 2.754 ps    (88.1 m%)
    pss: time = 10 us       (12.5 %), step = 4.421 ps     (141 m%)
    pss: time = 10 us       (17.5 %), step = 1.578 ps    (50.5 m%)
    pss: time = 10 us       (22.6 %), step = 3.909 ps     (125 m%)
    pss: time = 10 us       (27.6 %), step = 3.685 ps     (118 m%)
    pss: time = 10 us       (32.5 %), step = 5.096 ps     (163 m%)
    pss: time = 10 us       (37.7 %), step = 4.728 ps     (151 m%)
    pss: time = 10 us       (42.5 %), step = 5.73 ps      (183 m%)
    pss: time = 10 us       (47.5 %), step = 4.245 ps     (136 m%)
    pss: time = 10 us       (52.6 %), step = 4.476 ps     (143 m%)
    pss: time = 10 us       (57.6 %), step = 4.551 ps     (146 m%)
    pss: time = 10 us       (62.6 %), step = 4.195 ps     (134 m%)
    pss: time = 10 us       (67.6 %), step = 4.201 ps     (134 m%)
    pss: time = 10 us       (72.5 %), step = 2.355 ps    (75.4 m%)
    pss: time = 10 us       (77.6 %), step = 6.493 ps     (208 m%)
    pss: time = 10 us       (82.6 %), step = 6.012 ps     (192 m%)
    pss: time = 10 us       (87.6 %), step = 4.993 ps     (160 m%)
    pss: time = 10 us       (92.6 %), step = 4.291 ps     (137 m%)
    pss: time = 10 us       (97.6 %), step = 4.399 ps     (141 m%)
Conv norm = 118e+03, max dV(fout) = -67.3288 V, took 1.42 s.


Notice from spectre during periodic steady state analysis `pss'.
    50 warnings suppressed.
        Further occurrences of this notice will be suppressed.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us       (2.52 %), step = 5.164 ps     (165 m%)
    pss: time = 10 us       (7.53 %), step = 4.267 ps     (137 m%)
    pss: time = 10 us       (12.5 %), step = 2.5 ps        (80 m%)
    pss: time = 10 us       (17.6 %), step = 5.453 ps     (175 m%)
    pss: time = 10 us       (22.5 %), step = 4.258 ps     (136 m%)
    pss: time = 10 us       (27.5 %), step = 4.291 ps     (137 m%)
    pss: time = 10 us       (32.6 %), step = 5.427 ps     (174 m%)
    pss: time = 10 us       (37.6 %), step = 3.39 ps      (108 m%)
    pss: time = 10 us       (42.6 %), step = 3.814 ps     (122 m%)
    pss: time = 10 us       (47.6 %), step = 5.13 ps      (164 m%)
    pss: time = 10 us       (52.6 %), step = 4.032 ps     (129 m%)
    pss: time = 10 us       (57.6 %), step = 3.856 ps     (123 m%)
    pss: time = 10 us       (62.6 %), step = 4.398 ps     (141 m%)
    pss: time = 10 us       (67.6 %), step = 5.066 ps     (162 m%)
    pss: time = 10 us       (72.6 %), step = 4.316 ps     (138 m%)
    pss: time = 10 us       (77.5 %), step = 1.498 ps    (47.9 m%)
    pss: time = 10 us       (82.5 %), step = 6.846 ps     (219 m%)
    pss: time = 10 us       (87.6 %), step = 4.517 ps     (145 m%)
    pss: time = 10 us       (92.6 %), step = 2.343 ps      (75 m%)
    pss: time = 10 us       (97.6 %), step = 4.407 ps     (141 m%)
Conv norm = 33.5e+03, max dV(I9.net048) = 1.80529 V, took 1.38 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us       (2.52 %), step = 5.164 ps     (165 m%)
    pss: time = 10 us       (7.68 %), step = 6.57 ps      (210 m%)
    pss: time = 10 us       (12.6 %), step = 5.216 ps     (167 m%)
    pss: time = 10 us       (17.5 %), step = 3.74 ps      (120 m%)
    pss: time = 10 us       (22.7 %), step = 5.632 ps     (180 m%)
    pss: time = 10 us       (27.5 %), step = 1.52 ps     (48.6 m%)
    pss: time = 10 us       (32.5 %), step = 3.767 ps     (121 m%)
    pss: time = 10 us       (37.6 %), step = 3.668 ps     (117 m%)
    pss: time = 10 us       (42.6 %), step = 5.146 ps     (165 m%)
    pss: time = 10 us       (47.6 %), step = 4.079 ps     (131 m%)
    pss: time = 10 us       (52.6 %), step = 4.085 ps     (131 m%)
    pss: time = 10 us       (57.5 %), step = 4.373 ps     (140 m%)
    pss: time = 10 us       (62.5 %), step = 2.492 ps    (79.7 m%)
    pss: time = 10 us       (67.5 %), step = 5.557 ps     (178 m%)
    pss: time = 10 us       (72.6 %), step = 4.962 ps     (159 m%)
    pss: time = 10 us       (77.5 %), step = 2.367 ps    (75.7 m%)
    pss: time = 10 us       (82.6 %), step = 4.938 ps     (158 m%)
    pss: time = 10 us       (87.6 %), step = 4.765 ps     (152 m%)
    pss: time = 10 us       (92.7 %), step = 5.164 ps     (165 m%)
    pss: time = 10 us       (97.5 %), step = 4.979 ps     (159 m%)
Conv norm = 34.5e+03, max dV(I3.net75) = 1.87528 V, took 1.36 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================
    pss: time = 10 us       (2.52 %), step = 5.164 ps     (165 m%)
    pss: time = 10 us       (7.57 %), step = 5.234 ps     (167 m%)
    pss: time = 10 us       (12.5 %), step = 3.23 ps      (103 m%)
    pss: time = 10 us       (17.6 %), step = 4.432 ps     (142 m%)
    pss: time = 10 us       (22.6 %), step = 3.966 ps     (127 m%)
    pss: time = 10 us       (27.6 %), step = 4.098 ps     (131 m%)
    pss: time = 10 us       (32.5 %), step = 4.053 ps     (130 m%)
    pss: time = 10 us       (37.5 %), step = 6.306 ps     (202 m%)
    pss: time = 10 us       (42.6 %), step = 4.915 ps     (157 m%)
    pss: time = 10 us       (47.6 %), step = 4.663 ps     (149 m%)
    pss: time = 10 us       (52.6 %), step = 4.505 ps     (144 m%)
    pss: time = 10 us       (57.6 %), step = 5.06 ps      (162 m%)
    pss: time = 10 us       (62.6 %), step = 4.927 ps     (158 m%)
    pss: time = 10 us       (67.6 %), step = 5.032 ps     (161 m%)
    pss: time = 10 us       (72.6 %), step = 4.027 ps     (129 m%)
    pss: time = 10 us       (77.5 %), step = 6.918 ps     (221 m%)
    pss: time = 10 us       (82.6 %), step = 5.279 ps     (169 m%)
    pss: time = 10 us       (87.6 %), step = 4.242 ps     (136 m%)
    pss: time = 10 us       (92.5 %), step = 4.438 ps     (142 m%)
    pss: time = 10 us       (97.5 %), step = 2.155 ps      (69 m%)
Conv norm = 35.5e+03, max dV(net143) = 1.91203 V, took 1.4 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================

Warning from spectre at time = 10 us during periodic steady state analysis `pss'.
    WARNING (CMI-2139): I9.M18: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I9.M18: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M34: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I1.M34: The bulk-drain junction current exceeds `imax'.

    pss: time = 10 us       (2.52 %), step = 5.164 ps     (165 m%)
    pss: time = 10 us       (7.56 %), step = 4.609 ps     (148 m%)
    pss: time = 10 us       (12.6 %), step = 4.264 ps     (136 m%)
    pss: time = 10 us       (17.6 %), step = 3.642 ps     (117 m%)
    pss: time = 10 us       (22.6 %), step = 5.25 ps      (168 m%)
    pss: time = 10 us       (27.5 %), step = 4.201 ps     (134 m%)
    pss: time = 10 us       (32.6 %), step = 2.415 ps    (77.3 m%)
    pss: time = 10 us       (37.5 %), step = 4.194 ps     (134 m%)
    pss: time = 10 us       (42.6 %), step = 5.451 ps     (174 m%)
    pss: time = 10 us       (47.6 %), step = 3.953 ps     (127 m%)
    pss: time = 10 us       (52.5 %), step = 2.24 ps     (71.7 m%)
    pss: time = 10 us       (57.5 %), step = 5.103 ps     (163 m%)
    pss: time = 10 us       (62.5 %), step = 4.037 ps     (129 m%)
    pss: time = 10 us       (67.5 %), step = 4.823 ps     (154 m%)
    pss: time = 10 us       (72.5 %), step = 3.663 ps     (117 m%)
    pss: time = 10 us       (77.6 %), step = 5.643 ps     (181 m%)
    pss: time = 10 us       (82.5 %), step = 2.517 ps    (80.5 m%)
    pss: time = 10 us       (87.6 %), step = 4.068 ps     (130 m%)
    pss: time = 10 us       (92.5 %), step = 3.605 ps     (115 m%)
    pss: time = 10 us       (97.6 %), step = 5.154 ps     (165 m%)
Conv norm = 37.4e+03, max dV(I2.net75) = -2.94058 V, took 1.37 s.


===================================
`pss': time = (10 us -> 10.0031 us)
===================================

Warning from spectre at time = 10 us during periodic steady state analysis `pss'.
    WARNING (CMI-2139): M19: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): M19: The bulk-drain junction current exceeds `imax'.
    WARNING (CMI-2139): I1.M34: The bulk-drain junction current exceeds `imelt'.  The results computed by Virtuoso(R) Spectre are now incorrect because the junction current model has been linearized.
    WARNING (CMI-2144): I1.M34: The bulk-drain junction current exceeds `imax'.

    pss: time = 10 us       (2.52 %), step = 5.164 ps     (165 m%)
    pss: time = 10 us       (7.56 %), step = 4.609 ps     (148 m%)
    pss: time = 10 us       (12.5 %), step = 4.788 ps     (153 m%)
    pss: time = 10 us       (17.6 %), step = 3.9 ps       (125 m%)
    pss: time = 10 us       (22.6 %), step = 5.574 ps     (178 m%)
    pss: time = 10 us       (27.5 %), step = 3.722 ps     (119 m%)
    pss: time = 10 us       (32.5 %), step = 4.245 ps     (136 m%)
    pss: time = 10 us       (37.6 %), step = 3.947 ps     (126 m%)
    pss: time = 10 us       (42.6 %), step = 3.637 ps     (116 m%)
    pss: time = 10 us       (47.5 %), step = 4.499 ps     (144 m%)
    pss: time = 10 us       (52.6 %), step = 4.167 ps     (133 m%)
    pss: time = 10 us       (57.6 %), step = 5.591 ps     (179 m%)
    pss: time = 10 us       (62.7 %), step = 5.573 ps     (178 m%)
    pss: time = 10 us       (67.6 %), step = 4.995 ps     (160 m%)
    pss: time = 10 us       (72.5 %), step = 4.814 ps     (154 m%)
    pss: time = 10 us       (77.5 %), step = 3.513 ps     (112 m%)
    pss: time = 10 us       (82.6 %), step = 5.922 ps     (190 m%)
    pss: time = 10 us       (87.6 %), step = 5.294 ps     (169 m%)
    pss: time = 10 us       (92.5 %), step = 2.307 ps    (73.8 m%)
    pss: time = 10 us       (97.6 %), step = 4.138 ps     (132 m%)
Conv norm = 37.2e+03, max dV(net028) = 4.39536 V, took 1.28 s.


Opening the PSF file ../psf/pss.td.pss ...

Opening the PSF file ../psf/pss.fd.pss ...

The number of pss iterations has reached the maximum limit of 20 iterations. Specify a higher iteration limit in the `maxperiods' option.


Error found by spectre during periodic steady state analysis `pss'.
    ERROR (SPCRTRF-15044): pss analysis did not converge. The previous unconverged solution was saved.


The following set of suggestions might help you avoid these convergence difficulties.

 1. Evaluate and resolve any notice, warning, or error messages.

 2.  If there are Verilog-A modules in your circuits, ensure that your period is co-periodic with all sources and signals in Verilog-A modules.

 3.  Providing a larger value for tstab generally improves convergence. While not always necessary, one occasionally needs set tstab to a value equal or greater than the time needed for the circuit to approximately reach steady state.

 4.  While trapezoidal rule ringing is annoying in transient analysis, in PSS analysis it can cause the shooting iteration to stall before convergence is achieved. This problem can be remedied by changing the method from traponly to trap, gear2, or gear2only.

 5.  Increase the maximum iterations for shooting methods using the maxperiods parameter. Sometimes the analysis may need more than the default number of iterations to converge. However, there are situations that prevent convergence regardless of how many iterations are taken. In this case, increasing the iteration limit simply results in the simulator taking longer to fail.

 6.  If the shooting method approaches convergence and then stalls, it might be because the tolerance on the shooting method is too tight. In this case, try loosening steadyratio, which controls how close to steady-state the result must be before it is declared to be converged.

 7. Using the maxstep, reltol, lteratio, and errpreset parameters to tighten the normal simulation tolerances can help resolveconvergence problems in PSS. Avoid using errpreset=liberal.

Analysis `pss' was terminated prematurely due to an error.

Notice from spectre.
    175 notices suppressed.
Error found by spectre.
    ERROR (SPCRTRF-15024): The pnoise analysis was skipped because a PSS analysis must be run first.

Analysis `pnoise' was terminated prematurely due to an error.
modelParameter: writing model parameter values to rawfile.

Opening the PSF file ../psf/modelParameter.info ...
element: writing instance parameter values to rawfile.

Opening the PSF file ../psf/element.info ...
outputParameter: writing output parameter values to rawfile.

Opening the PSF file ../psf/outputParameter.info ...
designParamVals: writing netlist parameters to rawfile.

Opening the PSFASCII file ../psf/designParamVals.info ...
primitives: writing primitives to rawfile.

Opening the PSFASCII file ../psf/primitives.info.primitives ...
subckts: writing subcircuits to rawfile.

Opening the PSFASCII file ../psf/subckts.info.subckts ...

Aggregate audit (11:16:13 AM, Wed Feb 6, 2019):
Time used: CPU = 2.73 ks (45m  33.2s), elapsed = 2.74 ks (45m  42.7s), util. = 99.7%.
Time spent in licensing: elapsed = 1.19 s.
Peak memory used = 56.9 Mbytes.
Simulation started at: 10:30:31 AM, Wed Feb 6, 2019, ended at: 11:16:13 AM, Wed Feb 6, 2019, with elapsed time (wall clock): 2.74 ks (45m  42.7s).
spectre completes with 2 errors, 86 warnings, and 39 notices.

pancho_hideboo · Feb 7, 2019

Hardcopy of GUI is not useful at all.

Show me netlist fragments regarding pss and options.

kunalsan · Feb 7, 2019

the netlist for PSS simulation is:-

Code:

simulatorOptions options reltol=1e-3 vabstol=3e-5 iabstol=1e-11 temp=25.0 \
    tnom=27 multithread=on scalem=1.0 scale=1e-6 gmin=1e-12 rforce=1 \
    maxnotes=5 maxwarns=5 digits=5 cols=80 pivrel=1e-3 \
    sensfile="../psf/sens.output" checklimitdest=psf 
pss  pss  fund=320M  harms=5  errpreset=moderate  tstab=20u
+    saveinit=yes  param=reltol  param_vec=[1n  500e-3  2u  100e-3  4u
+    1e-3]  method=gear2only  tstabmethod=gear2only  annotate=status
+    maxiters=100
pnoise  (  fout  0  )  pnoise  sweeptype=relative  relharmnum=1
+       start=1M  stop=1G  pnoisemethod=fullspectrum  maxsideband=5
+       noisetype=timeaverage  noiseout=[usb]  annotate=status
modelParameter info what=models where=rawfile
element info what=inst where=rawfile
outputParameter info what=output where=rawfile
designParamVals info what=parameters where=rawfile
primitives info what=primitives where=rawfile
subckts info what=subckts where=rawfile
save down fout up vct vref net135 
saveOptions options save=selected

pancho_hideboo · Feb 7, 2019

Your reference frequency is 19MHz.
Why do you set fund of pss 320MHz ?

kunalsan · Feb 7, 2019

yes, I have changed fundamental frequency to 19MHz.

kunalsan · Feb 7, 2019

after changing fundamental frequency to 19MHz, PSS convergence problem is still present.

pancho_hideboo · Feb 7, 2019

For fund=320MHz, it reaches to maximum iteration limit of shooting trial without getting small conv norm.
This is very natural, since your setting of pss is very wrong.

What error do you face for fund=19MHz ?

Show me transient behavior of freq and amplitude of VOUT.

kunalsan · Feb 7, 2019

Actually, I am new in the PLL design. can you please give me the correct PSS setting regarding my work. It will be very helpful for me.
I have attached the transient behaviour of frequency and control voltage of PLL.
https://imgur.com/mmVNhF4
https://imgur.com/zJyiVwR

For fund=19MHz I am getting the following error

Code:

Error found by spectre during periodic steady state analysis `pss'.
    ERROR (SPCRTRF-15044): pss analysis did not converge. The previous unconverged solution was saved.


The following set of suggestions might help you avoid these convergence difficulties.

 1. Evaluate and resolve any notice, warning, or error messages.

 2.  If there are Verilog-A modules in your circuits, ensure that your period is co-periodic with all sources and signals in Verilog-A modules.

 3.  Providing a larger value for tstab generally improves convergence. While not always necessary, one occasionally needs set tstab to a value equal or greater than the time needed for the circuit to approximately reach steady state.

 4.  While trapezoidal rule ringing is annoying in transient analysis, in PSS analysis it can cause the shooting iteration to stall before convergence is achieved. This problem can be remedied by changing the method from traponly to trap, gear2, or gear2only.

 5.  Increase the maximum iterations for shooting methods using the maxperiods parameter. Sometimes the analysis may need more than the default number of iterations to converge. However, there are situations that prevent convergence regardless of how many iterations are taken. In this case, increasing the iteration limit simply results in the simulator taking longer to fail.

 6.  If the shooting method approaches convergence and then stalls, it might be because the tolerance on the shooting method is too tight. In this case, try loosening steadyratio, which controls how close to steady-state the result must be before it is declared to be converged.

 7. Using the maxstep, reltol, lteratio, and errpreset parameters to tighten the normal simulation tolerances can help resolveconvergence problems in PSS. Avoid using errpreset=liberal.

Analysis `pss' was terminated prematurely due to an error.

pancho_hideboo · Feb 10, 2019

kunalsan said:
Cadence (R) Virtuoso (R) Spectre (R) Circuit Simulator
Version 15.1.0.385.isr3 64bit -- 22 Feb 2016
..............................................................
Command line:
/home/user1/cadence/MMSIM151/tools/bin/spectre -64 input.scs \
+escchars +log ../psf/spectre.out -format psfxl -raw ../psf \
+aps +cktpreset=pll +lqtimeout 900 -maxw 5 -maxn 5

+cktpreset=pll has not effect at all.
Rather I recommend ++aps instead of +aps.

kunalsan said:
pss pss fund=320M harms=5 errpreset=moderate tstab=20u
+ saveinit=yes param=reltol param_vec=[1n 500e-3 2u 100e-3 4u
+ 1e-3] method=gear2only tstabmethod=gear2only annotate=status
+ maxiters=100

This analysis statement can not match to Spectre Logfile in https://www.edaboard.com/showthread.php?382266#3

Show me true informations.

I don't recommend tstabmethod=gear2only.
You set "method = traponly" for Transient Analysis.
On the other hand, you set "tstabmethod = gear2only" for tstab of PSS Analysis.

kunalsan said:
The value of parameter 'reltol' was set to 0.5 at time 1e-09 s.
The value of parameter 'reltol' was set to 0.1 at time 2e-06 s.
The value of parameter 'reltol' was set to 0.001 at time 4e-06 s.
The value of parameter 'reltol' was set to 0.001 at time 1.00031e-05 s.

And dynamic change of "reltol" during tstab(loose -> tight) is not useful at all.
Why do you set such thing ?
Don't do such tricky thing with your incomplete knowledge.

kunalsan said:
https://imgur.com/mmVNhF4
https://imgur.com/zJyiVwR

Waveform of "vct" is not useful.

Show me waveform of output of VCO and output of Divider which is an input of phase detector.

Your PLL can not reach to steady state with tstop=10usec.
Or simply your PLL can not work correctly due to improper LPF or charge pump setting.

kunalsan said:
Actually, I am new in the PLL design.
can you please give me the correct PSS setting regarding my work.

Your settings of both PSS and Pnoise are all wrong.
But your problem is not settings of both PSS and Pnoise.
Before going to PSS Analysis, you have to make your PLL work correctly with Transient Analysis.
https://www.edaboard.com/showthread.php?373837

kunalsan · Feb 13, 2019

sorry for late reply
VCO output and DIvider output are

pancho_hideboo · Feb 13, 2019

Run Transient Analysis until it can be locked state.

kunalsan · Feb 14, 2019

I have done a transient analysis of PLL. The reference waveform and divider output waveform is in the figure. Both are in-phase, it shows the PLL is in the locked condition.
https://imgur.com/297rU3R

pancho_hideboo · Feb 14, 2019

Show me rf output frequency.

kunalsan · Feb 14, 2019

output frequency plot
https://imgur.com/JhiPlzh

pancho_hideboo · Feb 14, 2019

Teach me unit of x-axis.

Is an output frequency 128*19MHz=2432MHz ?

kunalsan · Feb 14, 2019

yes, the VCO output frequency in locked condition after 2 microseconds is 2440MHz.
The x-axis in that plot is transient simulation time. I have plotted that graph by the calculator in cadence virtuoso using "freq" function on VCO output signal.

pancho_hideboo · Feb 14, 2019

kunalsan said:
I have done a transient analysis of PLL.
The reference waveform and divider output waveform is in the figure.
Both are in-phase, it shows the PLL is in the locked condition.

No, it can not be locked according to https://i.imgur.com/mmVNhF4.png

kunalsan said:
yes, the VCO output frequency in locked condition after 2 microseconds is 2440MHz.

Why is not it 128*19MHz=2432MHz ?

https://i.imgur.com/JhiPlzh.png is completely different from https://i.imgur.com/mmVNhF4.png

Show me true informations.

kunalsan · Feb 15, 2019

Actually, I have changed the loop capacitor value. Please suggest me the required condition for PLL to be locked.
https://i.imgur.com/JhiPlzh.png

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PSS convergence in PLL simulation

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Advanced Member level 5

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Advanced Member level 5

Junior Member level 1

Advanced Member level 5

Junior Member level 1

Advanced Member level 5

Junior Member level 1

Advanced Member level 5

Junior Member level 1

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