I got a problem in OrCAD Pspice

[sunbox23]

I got a problem in OrCAD Pspice ,I really need you help !!
The error code is :
**** 05/13/10 01:41:38 ******* PSpice 10.5.0 (Jan 2005) ******* ID# 2090008641
** Profile: "SCHEMATIC1-1" [ D:\PROGRAM FILES\ORCAD\ORCAD_10.5\1\testfile1-pspicefiles\schematic1\1.sim ]


**** CIRCUIT DESCRIPTION


******************************************************************************




** Creating circuit file "1.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS

*Libraries:
* Profile Libraries :
* Local Libraries :
.LIB "../../../testfile1-pspicefiles/testfile1.lib"
* From [PSPICE NETLIST] section of D:\Program Files\OrCAD\OrCAD_10.5\tools\PSpice\PSpice.ini file:
.lib "nom.lib"

*Analysis directives:
.DC LIN V_V1 0 0.75 0.03
.PROBE V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"



**** INCLUDING SCHEMATIC1.net ****
* source TESTFILE1
M_Q4 N01682 N01574 N01584 N01682 PMOS
+ L=1um
+ W=1um
M_Q11 N01682 N08904 N01578 N01682 PMOS
+ L=1um
+ W=1um
M_Q21 N04309 N46954 N01574 N04309 PMOS
+ L=1um
+ W=1um
M_Q23 N05186 N12068 N02017 N02017 NMOS
+ L=1um
+ W=1um
M_Q15 N01682 N04834 N04834 N01682 PMOS
+ L=1um
+ W=1um
M_Q26 N04309 N46954 N07827 N07827 NMOS
+ L=1um
+ W=1um
R_R1 N41930 N35445 0.1
M_Q6 N01584 N01574 N01614 N01584 PMOS
+ L=1um
+ W=1um
M_Q18 N04309 0 N01662 N04309 PMOS
+ L=1um
+ W=1um
M_Q14 N01574 N12068 N02017 N02017 NMOS
+ L=1um
+ W=1um
V_V1 N46954 0 0Vdc
M_Q29 N12068 N12068 N02017 N02017 NMOS
+ L=1um
+ W=1um
M_Q12 N01578 N01578 N02017 N02017 NMOS
+ L=1um
+ W=1um
M_Q7 N01578 N01574 N01574 N01578 PMOS
+ L=1um
+ W=1um
M_Q25 N07827 N07827 N02017 N02017 NMOS
+ L=1um
+ W=1um
M_Q33 N01682 N16741 N16741 N01682 PMOS
+ L=1um
+ W=1um
V_V2 0 N02017 0.75Vdc
M_Q22 N01578 N46954 N05186 N05186 NMOS
+ L=1um
+ W=1um
M_Q13 N01682 N01574 N01574 N01682 PMOS
+ L=1um
+ W=1um
M_Q16 N01682 N04834 N04309 N01682 PMOS
+ L=1um
+ W=3um
M_Q39 N34066 N34066 N02017 N02017 NMOS
+ L=1um
+ W=1um
Q_Q41 N02017 N02017 N41930 Q2N4058
M_Q8 N01574 N01578 N01574 N01574 NMOS
+ L=1um
+ W=1um
M_Q34 N01682 N25242 N35445 N01682 PMOS
+ L=1um
+ W=1um
Q_Q40 N02017 N02017 N42176 Q2N4058
V_V3 N01682 0 0.75Vdc
M_Q20 N01682 N08904 N04309 N01682 PMOS
+ L=1um
+ W=1um
M_Q38 N32096 N34066 N02017 N02017 NMOS
+ L=1um
+ W=1um
M_Q37 N25242 N42176 N32096 N32096 NMOS
+ L=1um
+ W=1um
M_Q32 N01682 N16741 N25242 N01682 PMOS
+ L=1um
+ W=1um
M_Q28 N08904 N12068 N02017 N02017 NMOS
+ L=1um
+ W=1um
M_Q35 N01682 N25242 N42176 N01682 PMOS
+ L=1um
+ W=1um
M_Q36 N16741 N35445 N32096 N32096 NMOS
+ L=1um
+ W=1um
M_Q27 N01682 N08904 N08904 N01682 PMOS
+ L=1um
+ W=1um
M_Q42 N01682 N01614 N45584 N01682 PMOS
+ L=1um
+ W=1um
M_Q3 N01614 N01578 N01662 N01662 NMOS
+ L=1um
+ W=1um
M_Q9 N01662 N12068 N02017 N02017 NMOS
+ L=1um
+ W=1um
M_Q19 N01584 0 N05186 N05186 NMOS
+ L=1um
+ W=1um
M_Q31 N01682 N25242 N34066 N01682 PMOS
+ L=1um
+ W=1um
M_Q24 N05186 N07827 N02017 N02017 NMOS
+ L=1um
+ W=3um
M_Q17 N04834 0 N05186 N04834 PMOS
+ L=1um
+ W=1um
M_Q10 N01574 N12068 N02017 N02017 NMOS
+ L=1um
+ W=1um
M_Q43 N45584 N01614 N02017 N02017 NMOS
+ L=1um
+ W=1um
M_Q5 N01682 N01574 N01578 N01682 PMOS
+ L=1um
+ W=1um
M_Q30 N01682 N25242 N12068 N01682 PMOS
+ L=1um
+ W=1um

**** RESUMING 1.cir ****
.END

WARNING -- Library file "D:\PROGRAM FILES\ORCAD\ORCAD_10.5\1\testfile1-pspicefiles\testfile1.lib" has changed since index file testfile1.ind was created.
WARNING -- The timestamp changed from Thu May 13 01:40:24 2010 to Thu May 13 01:41:31 2010.
Making new index file testfile1.ind for library file testfile1.lib
Index has 2 entries from 1 file(s).

WARNING -- Mosfet M_Q4, model PMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q4, model PMOS: Ps = 0 is less than W
WARNING -- Parameter XL in model PMOS is invalid - Ignored
WARNING -- Mosfet M_Q16, model PMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q16, model PMOS: Ps = 0 is less than W
WARNING -- Mosfet M_Q23, model NMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q23, model NMOS: Ps = 0 is less than W
WARNING -- Parameter XL in model NMOS is invalid - Ignored
WARNING -- Mosfet M_Q24, model NMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q24, model NMOS: Ps = 0 is less than W
**** 05/13/10 01:41:38 ******* PSpice 10.5.0 (Jan 2005) ******* ID# 2090008641
** Profile: "SCHEMATIC1-1" [ D:\PROGRAM FILES\ORCAD\ORCAD_10.5\1\testfile1-pspicefiles\schematic1\1.sim ]


**** BJT MODEL PARAMETERS


******************************************************************************




Q2N4058
PNP
LEVEL 1
IS 6.734000E-15
BF 185.8
NF 1
VAF 45.7
IKF .1845
ISE 6.734000E-15
NE 1.692
BR 2.736
NR 1
ISS 0
RB 10
RE 0
RC 1.67
CJE 7.500000E-12
VJE .75
MJE .2861
CJC 6.200000E-12
VJC .75
MJC .301
XCJC 1
CJS 0
VJS .75
TF 568.900000E-12
XTF 8
VTF 5
ITF .17
TR 10.380000E-09
XTB 1.5
KF 0
AF 1
CN 2.2
D .52


**** 05/13/10 01:41:38 ******* PSpice 10.5.0 (Jan 2005) ******* ID# 2090008641
** Profile: "SCHEMATIC1-1" [ D:\PROGRAM FILES\ORCAD\ORCAD_10.5\1\testfile1-pspicefiles\schematic1\1.sim ]


**** MOSFET MODEL PARAMETERS


******************************************************************************




PMOS NMOS
PMOS NMOS
T_Measured 27 27
T_Current 27 27
LEVEL 7 7
L 100.000000E-06 100.000000E-06
W 100.000000E-06 100.000000E-06
VTO -.663659 .496445
KP 272.616600E-06 272.616600E-06
GAMMA 0 0
LAMBDA 0 0
IS 1.000000E-15 1.000000E-15
JS 100.000000E-06 100.000000E-06
PB .99 .815796
PBSW .99 .686915
CJ 1.420282E-03 927.696200E-06
CJSW 477.360500E-12 318.105500E-12
MJ .549088 .35577
MJSW .199742 .1
CGSO 230.700000E-12 196.000000E-12
CGDO 230.700000E-12 196.000000E-12
CGBO 0 0
TOX 7.600000E-09 7.600000E-09
XJ 150.000000E-09 150.000000E-09
UCRIT 10.000000E+03 10.000000E+03
DELTA .01 .01
DIOMOD 2 2
K1 .456478 .530777
K2 -.019447 .019971
LETA 0 0
WETA 0 0
U0 151.3306 444.9382
XPART .4 .4
VTH0 -.663659 .496445
K3 39.38292 .296364
W0 2.655585E-06 2.836319E-06
NLX 151.028000E-09 289.480200E-09
DVT0 1.174458 .112017
DVT1 .763113 .245397
UA 206.121100E-12 292.128400E-12
UB 1.823477E-18 1.773281E-18
UC -8.973210E-12 70.678960E-12
VSAT 99.156040E+03 113.078500E+03
RDSW 2.307250E+03 925.2702
VOFF -.15 -.132935
NFACTOR 2 .571097
CDSC 659.308400E-06 860.722900E-06
PCLM 4.359751 .676631
PDIBL1 744.702400E-06 1
PDIBL2 4.256073E-03 1.787424E-03
DROUT .012029 .787354
PSCBE1 13.476220E+09 6.973485E+09
PSCBE2 5.000000E-09 146.235000E-09
A0 1.121005 1.135625
A1 0 0
A2 1 1
NPEAK 170.000000E+15 170.000000E+15
LDD 0 0
LITL 58.480770E-09 58.480770E-09
UC1 -56.000000E-12 -56.000000E-12
PVAG 3.669793 .05
KETA -9.270000E-03 -7.818100E-03
ETA0 .028646 2.128321E-03
ETAB 0 0
K3B -2.893096 .201217
DVT2 -.103517 -.171915
DSUB .243603 .025796
AGS .396195 .281037
PRWG -1.000000E-03 -1.000000E-03
PRWB -1.000000E-03
DWG -15.962010E-09 -17.129730E-09
DWB 13.789190E-09 5.851691E-09
B0 649.313900E-09 284.439300E-09
B1 4.273215E-06 5.000000E-06
LINT 4.309280E-09 1.735515E-09
WINT 59.622330E-09 71.869650E-09
DLC 4.309280E-09 1.735515E-09
DWC 59.622330E-09 71.869650E-09
CF 87.540920E-12 87.540920E-12
NOIA 9.900001E+18 100.000000E+18
NOIB 2.400000E+03 50.000000E+03
NOIC 1.400000E-12 -1.400000E-12
LKETA 6.027967E-03 -.01295
WKETA -.01014 -764.318700E-06
PVTH0 6.587070E-03 -.025248
PRDSW -93.55822 -96.45028
PK2 1.011593E-03 -4.805372E-03
VTM .025864 .025864
PBSWG .99 .686915
MJSWG .199742 .1
CJSWG 477.360500E-12 318.105500E-12


WARNING -- Mosfet M_Q4, model PMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q4, model PMOS: Ps = 0 is less than W
WARNING -- Parameter XL in model PMOS is invalid - Ignored
WARNING -- Mosfet M_Q16, model PMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q16, model PMOS: Ps = 0 is less than W
WARNING -- Mosfet M_Q23, model NMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q23, model NMOS: Ps = 0 is less than W
WARNING -- Parameter XL in model NMOS is invalid - Ignored
WARNING -- Mosfet M_Q24, model NMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q24, model NMOS: Ps = 0 is less than W
WARNING -- Mosfet M_Q4, model PMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q4, model PMOS: Ps = 0 is less than W
WARNING -- Parameter XL in model PMOS is invalid - Ignored
WARNING -- Mosfet M_Q16, model PMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q16, model PMOS: Ps = 0 is less than W
WARNING -- Mosfet M_Q23, model NMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q23, model NMOS: Ps = 0 is less than W
WARNING -- Parameter XL in model NMOS is invalid - Ignored
WARNING -- Mosfet M_Q24, model NMOS: Pd = 0 is less than W
WARNING -- Mosfet M_Q24, model NMOS: Ps = 0 is less than W
ERROR -- Convergence problem in DC sweep


Last node voltages tried were:

NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE


(N01574) -.0311 (N01578) -.1202 (N01584) -.0741 (N01614) -.2390

(N01662) -.2408 (N01682) .2573 (N02017) -.2573 (N04309) -.1110

(N04834) .1035 (N05186) -.1324 (N07827) -.1356 (N08904) .0343

(N12068) -.1831 (N16741) .0916 (N25242) .0916 (N32096) -.1585

(N34066) -.1831 (N35445) -.1516 (N41930) -.1516 (N42176) -.1516

(N45584) .2573 (N46954) 0.0000


These voltages failed to converge:

V(N01574) = -30.97mV \ -31.12mV
V(N01584) = -75.71mV \ -74.10mV
V(N01578) = -120.31mV \ -120.17mV
V(N04309) = -111.20mV \ -111.02mV

ERROR -- Discontinuing simulation due to convergence problem
**** Interrupt ****

Please,give me a hand,thanks a lot

 

[srizbf]

if you can tell what is this circuit?
(or) , please give V_V1 , V_V2 and V_V3 where they are connected ?

what is their normal voltage of operation? .

getting the idea of circuit from netlist is somewhat time consuming ,
except for the original designer (and ofcourse for spice --no problem).

srizbf
12thmay2010

 

[keith1200rs]

You need to post the circuit - that is where the problem is!

Keith

 

[sunbox23]

this is a circuit of CMOS Low-Power Operational Amplifier

the picture of the circuit is in the attachment:


I am also puzzled by the following errors :
ERROR -- Convergence problem in DC sweep
and ERROR -- Discontinuing simulation due to convergence problem

how to solve these questions ？
thanks you for helping me.

 

[keith1200rs]

Is that what you have drawn in Orcad or what you should have drawn? I cannot seen the power supplies and input voltages in your netlist or input circuit, or any feedback mechanism.

Normally convergence problems like this are due to floating nodes - missed connections, crossovers where you think there is a connection, current mirrors where the gate-drain link is missing etc.

In particular, check the connections to the nodes reported at the end of the list file: "nodes that failed to converge".

Keith.

 

[sunbox23]

In that picture , there is not include the Supply voltage and input signals.

But in pspice schemattic document picture ,they are included

 

[keith1200rs]

There may be other problems, but check the gate of Q26 is connected properly. Also, you have a short circuit with Q4/5/6/7 gates all connected. Q4 and Q5 gates should be connected and Q5 & Q6, but not to Q4/Q5.

Keith.

 

[sunbox23]

There may be other problems, but check the gate of Q26 is connected properly. Also, you have a short circuit with Q4/5/6/7 gates all connected. Q4 and Q5 gates should be connected and Q5 & Q6, but not to Q4/Q5.

Keith.

I modify Q26's gate and check Q4/5/6/7:

but the problem is still not resolved.

how to set parameters in this picture when simulation is running:

 

[keith1200rs]

Q21 drain is shorted to Q14 drain. You need to carefully check your diagram.

Keith.

Added after 1 minutes:

and Q11 drain is shorted to Q5 drain.

Keith.

 

[sunbox23]

Q21 drain is shorted to Q14 drain. You need to carefully check your diagram.

Keith.

Added after 1 minutes:

and Q11 drain is shorted to Q5 drain.

Keith.

Oh,it's my fault.I should be more carefully.Thank you very much.

 

[keith1200rs]

When you have fixed the drawing errors, if you still get a convergence problem, repost the schematic and the error report and I will try to help. There may still be an error - I cannot be certain that the short circuits you have would have caused the error but when there are quite a few errors it can be difficult to spot the real one.

These shorts are not uncommon. I get them on my simulation software as well. It is because if you cross a component pin the software assumes you want to connect it. You will get used to looking for them!

Keith.

 

[sunbox23]

When you have fixed the drawing errors, if you still get a convergence problem, repost the schematic and the error report and I will try to help. There may still be an error - I cannot be certain that the short circuits you have would have caused the error but when there are quite a few errors it can be difficult to spot the real one.

These shorts are not uncommon. I get them on my simulation software as well. It is because if you cross a component pin the software assumes you want to connect it. You will get used to looking for them!

Keith.

I am fixing the drawing errors and looking over the circuit again.
Maybe I also should modify the circuit of bandgap reference.
Thank you for your help.I really appreciate it.

sunbox.