promach
Advanced Member level 4
I am having some issue interpreting the following AC phase plot.
The AC gain plot is ok, rolling off at high frequencies, but what about the AC phase plot which increases from 0 towards 180 degrees at higher frequencies ?
Note: The current input stimulus and feedback resistor is configuring the inverter as a transimpedance amplifier. It’s to avoid disturbing the dc bias.
https://i.imgur.com/3Y0apMv.png
test_cmos_inverter.asc
tsmc180nmcmos.lib
The AC gain plot is ok, rolling off at high frequencies, but what about the AC phase plot which increases from 0 towards 180 degrees at higher frequencies ?
Note: The current input stimulus and feedback resistor is configuring the inverter as a transimpedance amplifier. It’s to avoid disturbing the dc bias.
https://i.imgur.com/3Y0apMv.png
test_cmos_inverter.asc
Code:
Version 4
SHEET 1 2264 2956
WIRE 256 -48 240 -48
WIRE 528 -48 256 -48
WIRE 240 0 240 -48
WIRE 256 48 256 -48
WIRE 256 48 240 48
WIRE 192 80 160 80
WIRE 160 160 160 80
WIRE 240 160 240 96
WIRE 240 192 240 160
WIRE 272 192 240 192
WIRE 384 192 272 192
WIRE 112 224 0 224
WIRE 160 224 160 160
WIRE 160 224 112 224
WIRE 240 224 240 192
WIRE 0 272 0 224
WIRE 256 272 240 272
WIRE 528 288 528 -48
WIRE 160 304 160 224
WIRE 192 304 160 304
WIRE 240 352 240 320
WIRE 256 352 256 272
WIRE 256 352 240 352
WIRE 0 416 0 352
WIRE 256 416 256 352
WIRE 256 416 0 416
WIRE 352 416 256 416
WIRE 384 416 384 272
WIRE 384 416 352 416
WIRE 528 416 528 368
WIRE 528 416 384 416
WIRE 352 448 352 416
FLAG 352 448 0
FLAG 112 224 in
FLAG 272 192 out
SYMBOL nmos4 192 224 R0
SYMATTR InstName M1
SYMATTR Value TSMC180nmN
SYMATTR Value2 l=3u w=1.2u
SYMBOL voltage 528 272 R0
SYMATTR InstName V1
SYMATTR Value 1.0
SYMBOL pmos4 192 0 R0
SYMATTR InstName M2
SYMATTR Value TSMC180nmP
SYMATTR Value2 l=3u w=0.4u
SYMBOL current 0 272 R0
WINDOW 123 24 102 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName I1
SYMATTR Value 0
SYMBOL res 256 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 2 135 VTop 2
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL current 384 192 R0
WINDOW 123 39 50 Left 2
WINDOW 3 68 23 Left 2
SYMATTR Value2 AC 0
SYMATTR InstName I2
SYMATTR Value 0
TEXT 864 176 Left 2 !.op
TEXT 872 200 Left 2 !.ac dec 100 1 10g
TEXT 816 328 Left 2 !.include tsmc180nmcmos.lib
TEXT 808 256 Left 2 !;.dc I1 -165n 165n 1n
tsmc180nmcmos.lib
Code:
* PSPICE TSMC180nm.lib file RWN 04/18/2010
* library file for transistor parameters for TMSC 0.18 micron process
* uses BIM parameters added 01/15/98
* can configure and attach to Nbreak and Pbreak transistors in PSpice
****
****************** 180nm TSMC parameters *************
*T14B SPICE BSIM3 VERSION 3.1 PARAMETERS
* downloaded from MOSIS 04/18/10
*http://www.mosis.com/cgi-bin/cgiwrap/umosis/swp/params/
* tsmc-018/t92y_mm_non_epi_thk_mtl_params.txt
*SPICE 3f5 Level 8, Star-HSPICE Level 49, UTMOST Level 8
* DATE: Jun 8/01
* LOT: T14B WAF: 06
* Temperature_parameters=Default
*$
.MODEL TSMC180nmN NMOS ( LEVEL = 7
+VERSION = 3.1 TNOM = 27 TOX = 4.1E-9
+XJ = 1E-7 NCH = 2.3549E17 VTH0 = 0.354505
+K1 = 0.5733393 K2 = 3.177172E-3 K3 = 27.3563303
+K3B = -10 W0 = 2.341477E-5 NLX = 1.906617E-7
+DVT0W = 0 DVT1W = 0 DVT2W = 0
+DVT0 = 1.6751718 DVT1 = 0.4282625 DVT2 = 0.036004
+U0 = 327.3736992 UA = -4.52726E-11 UB = 4.46532E-19
+UC = -4.74051E-11 VSAT = 8.785346E4 A0 = 1.6897405
+AGS = 0.2908676 B0 = -8.224961E-9 B1 = -1E-7
+KETA = 0.021238 A1 = 8.00349E-4 A2 = 1
+RDSW = 105 PRWG = 0.5 PRWB = -0.2
+WR = 1 WINT = 0 LINT = 1.351737E-8
*+XL = -2E-8 XW = -1E-8
+ DWG = 1.610448E-9
+DWB = -5.108595E-9 VOFF = -0.0652968 NFACTOR = 2.4901845
+CIT = 0 CDSC = 2.4E-4 CDSCD = 0
+CDSCB = 0 ETA0 = 0.0231564 ETAB = -0.058499
+DSUB = 0.9467118 PCLM = 0.8512348 PDIBLC1 = 0.0929526
+PDIBLC2 = 0.01 PDIBLCB = -0.1 DROUT = 0.5224026
+PSCBE1 = 7.979323E10 PSCBE2 = 1.522921E-9 PVAG = 0.01
+DELTA = 0.01 RSH = 6.8 MOBMOD = 1
+PRT = 0 UTE = -1.5 KT1 = -0.11
+KT1L = 0 KT2 = 0.022 UA1 = 4.31E-9
+UB1 = -7.61E-18 UC1 = -5.6E-11 AT = 3.3E4
+WL = 0 WLN = 1 WW = 0
+WWN = 1 WWL = 0 LL = 0
+LLN = 1 LW = 0 LWN = 1
+LWL = 0 CAPMOD = 2 XPART = 0.5
+CGDO = 7.7E-10 CGSO = 7.7E-10 CGBO = 1E-12
+CJ = 1.010083E-3 PB = 0.7344298 MJ = 0.3565066
+CJSW = 2.441707E-10 PBSW = 0.8005503 MJSW = 0.1327842
+CJSWG = 3.3E-10 PBSWG = 0.8005503 MJSWG = 0.1327842
+CF = 0 PVTH0 = 1.307195E-3 PRDSW = -5
+PK2 = -1.022757E-3 WKETA = -4.466285E-4 LKETA = -9.715157E-3
+PU0 = 12.2704847 PUA = 4.421816E-11 PUB = 0
+PVSAT = 1.707461E3 PETA0 = 1E-4 PKETA = 2.348777E-3 )
*
*$
.MODEL TSMC180nmP PMOS ( LEVEL = 7
+VERSION = 3.1 TNOM = 27 TOX = 4.1E-9
+XJ = 1E-7 NCH = 4.1589E17 VTH0 = -0.4120614
+K1 = 0.5590154 K2 = 0.0353896 K3 = 0
+K3B = 7.3774572 W0 = 1E-6 NLX = 1.103367E-7
+DVT0W = 0 DVT1W = 0 DVT2W = 0
+DVT0 = 0.4301522 DVT1 = 0.2156888 DVT2 = 0.1
+U0 = 128.7704538 UA = 1.908676E-9 UB = 1.686179E-21
+UC = -9.31329E-11 VSAT = 1.658944E5 A0 = 1.6076505
+AGS = 0.3740519 B0 = 1.711294E-6 B1 = 4.946873E-6
+KETA = 0.0210951 A1 = 0.0244939 A2 = 1
+RDSW = 127.0442882 PRWG = 0.5 PRWB = -0.5
+WR = 1 WINT = 5.428484E-10 LINT = 2.468805E-8
*+XL = -2E-8 XW = -1E-8
+DWG = -2.453074E-8
+DWB = 6.408778E-9 VOFF = -0.0974174 NFACTOR = 1.9740447
+CIT = 0 CDSC = 2.4E-4 CDSCD = 0
+CDSCB = 0 ETA0 = 0.1847491 ETAB = -0.2531172
+DSUB = 1.5 PCLM = 4.8842961 PDIBLC1 = 0.0156227
+PDIBLC2 = 0.1 PDIBLCB = -1E-3 DROUT = 0
+PSCBE1 = 1.733878E9 PSCBE2 = 5.002842E-10 PVAG = 15
+DELTA = 0.01 RSH = 7.7 MOBMOD = 1
+PRT = 0 UTE = -1.5 KT1 = -0.11
+KT1L = 0 KT2 = 0.022 UA1 = 4.31E-9
+UB1 = -7.61E-18 UC1 = -5.6E-11 AT = 3.3E4
+WL = 0 WLN = 1 WW = 0
+WWN = 1 WWL = 0 LL = 0
+LLN = 1 LW = 0 LWN = 1
+LWL = 0 CAPMOD = 2 XPART = 0.5
+CGDO = 7.11E-10 CGSO = 7.11E-10 CGBO = 1E-12
+CJ = 1.179334E-3 PB = 0.8545261 MJ = 0.4117753
+CJSW = 2.215877E-10 PBSW = 0.6162997 MJSW = 0.2678074
+CJSWG = 4.22E-10 PBSWG = 0.6162997 MJSWG = 0.2678074
+CF = 0 PVTH0 = 2.283319E-3 PRDSW = 5.6431992
+PK2 = 2.813503E-3 WKETA = 2.438158E-3 LKETA = -0.0116078
+PU0 = -2.2514581 PUA = -7.62392E-11 PUB = 4.502298E-24
+PVSAT = -50 PETA0 = 1E-4 PKETA = -1.047892E-4 )
*
*.ENDS
*$