I got a problem in OrCAD Pspice

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

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

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

Keith

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.

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.

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

But in pspice schemattic document picture ,they are included

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.

keith1200rs said:

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.

Click to expand...

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:

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.

keith1200rs said:

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.

Click to expand...

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

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.

keith1200rs said:

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.

Click to expand...

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.