[MOVED]convergence problem in transient analysis


**** 11/02/11 05:32:20 ******* PSpice 10.0.0 (Jan 2003) ******* ID# 1111111111
** Profile: "SCHEMATIC1-gener1" [ D:\for ORCAD\_circuits\Igenerator-PSpiceFiles\SCHEMATIC1\gener1.sim ]


**** CIRCUIT DESCRIPTION


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




** Creating circuit file "gener1.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS

*Libraries:
* Profile Libraries :
* Local Libraries :
* From [PSPICE NETLIST] section of C:\OrCAD\OrCAD_10.0\tools\PSpice\PSpice.ini file:
.lib "nom.lib"

*Analysis directives:
.TRAN 0 10ns 0
.PROBE V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"



**** INCLUDING SCHEMATIC1.net ****
* source IGENERATOR
V_V1 N00554 0 2.5Vdc
V_V2 N02391 N02471 5Vdc
X_U1A N00307 N00279 N02391 N02471 N00307 LM324
X_U1B N00258 N00292 N02391 N02471 N00266 LM324
R_R1 N00266 N00258 25k
R_R2 N00258 0 25k
R_R3 N00307 N00292 25k
R_R4 N00292 N00554 25k
R_R5 N00279 N00266 2.5k
R_R6 0 N00279 {100*0.5+.001}

**** RESUMING gener1.cir ****
.END

**** 11/02/11 05:32:20 ******* PSpice 10.0.0 (Jan 2003) ******* ID# 1111111111
** Profile: "SCHEMATIC1-gener1" [ D:\for ORCAD\_circuits\Igenerator-PSpiceFiles\SCHEMATIC1\gener1.sim ]


**** Diode MODEL PARAMETERS


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




X_U1A.dx X_U1A.dy X_U1B.dx X_U1B.dy
IS 800.000000E-18 800.000000E-18 800.000000E-18 800.000000E-18
RS 1 1.000000E-03 1 1.000000E-03
CJO 10.000000E-12 10.000000E-12


**** 11/02/11 05:32:20 ******* PSpice 10.0.0 (Jan 2003) ******* ID# 1111111111
** Profile: "SCHEMATIC1-gener1" [ D:\for ORCAD\_circuits\Igenerator-PSpiceFiles\SCHEMATIC1\gener1.sim ]


**** BJT MODEL PARAMETERS


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




X_U1A.qx X_U1B.qx
PNP PNP
IS 800.000000E-18 800.000000E-18
BF 166.7 166.7
NF 1 1
BR 1 1
NR 1 1
CN 2.2 2.2
D .52 .52


**** 11/02/11 05:32:20 ******* PSpice 10.0.0 (Jan 2003) ******* ID# 1111111111
** Profile: "SCHEMATIC1-gener1" [ D:\for ORCAD\_circuits\Igenerator-PSpiceFiles\SCHEMATIC1\gener1.sim ]


**** Current Controlled Switch MODEL PARAMETERS


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




X_U1A.sw2 X_U1A.sw1 X_U1A.sw3 X_U1A.sw4
RON 1 1 1 1
ROFF 10.000000E+06 10.000000E+06 10.000000E+06 10.000000E+06
ION 0 -1.000000E-06 -1.000000E-06 0
IOFF -1.000000E-06 0 0 -1.000000E-06


X_U1B.sw2 X_U1B.sw1 X_U1B.sw3 X_U1B.sw4
RON 1 1 1 1
ROFF 10.000000E+06 10.000000E+06 10.000000E+06 10.000000E+06
ION 0 -1.000000E-06 -1.000000E-06 0
IOFF -1.000000E-06 0 0 -1.000000E-06


**** 11/02/11 05:32:20 ******* PSpice 10.0.0 (Jan 2003) ******* ID# 1111111111
** Profile: "SCHEMATIC1-gener1" [ D:\for ORCAD\_circuits\Igenerator-PSpiceFiles\SCHEMATIC1\gener1.sim ]


**** INITIAL TRANSIENT SOLUTION TEMPERATURE = 27.000 DEG C


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



NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE


(N00258) .1162 (N00266) .2313 (N00279) .0045 (N00292) .1161

(N00307) -2.2690 (N00554) 2.5000 (N02391) 2.7252 (N02471) -2.2748

(X_U1A.6) 1.5028 (X_U1A.7) -4.2995

(X_U1A.8) -4.2995 (X_U1A.9) 0.0000

(X_U1A.a) .0406 (X_U1A.b) -2.2342

(X_U1B.6)-2.519E-06 (X_U1B.7) .2361

(X_U1B.8) .2361 (X_U1B.9) 0.0000

(X_U1B.a) 2.7251 (X_U1B.b)-95.55E-06

(X_U1A.10) -1.6288 (X_U1A.11) -2.2748

(X_U1A.12) -2.1945 (X_U1A.13) -1.6288

(X_U1A.14) -1.6569 (X_U1A.53) 1.2252

(X_U1A.54) -1.4528 (X_U1A.90) -40.6100

(X_U1A.91) 40.0000 (X_U1A.92) -40.0000

(X_U1A.99) .2252 (X_U1B.10) .7238

(X_U1B.11) -2.2350 (X_U1B.12) -2.2352

(X_U1B.13) .7099 (X_U1B.14) .7100

(X_U1B.53) 1.2252 (X_U1B.54) -1.4528

(X_U1B.90) .0953 (X_U1B.91) 40.0000

(X_U1B.92) -40.0000 (X_U1B.99) .2252




VOLTAGE SOURCE CURRENTS
NAME CURRENT

V_V1 -9.536E-05
V_V2 -1.227E-03
X_U1A.vb 1.503E-05
X_U1A.vc 3.495E-12
X_U1A.ve -4.051E-02
X_U1A.vlim -4.061E-02
X_U1A.vlp -8.061E-11
X_U1A.vln 1.391E-05
X_U1B.vb -2.519E-11
X_U1B.vc 9.947E-13
X_U1B.ve 1.649E-12
X_U1B.vlim 9.532E-05
X_U1B.vlp -3.991E-11
X_U1B.vln -4.010E-11

TOTAL POWER DISSIPATION 3.91E-02 WATTS


ERROR -- Convergence problem in transient analysis at Time = 116.5E-12
Time step = 7.451E-21, minimum allowable step size = 10.00E-21

These voltages failed to converge:

V(X_U1B.6) = -20.78uV \ -32.93uV
V(X_U1B.90) = 99.09mV \ 101.61mV
V(X_U1B.b) = -99.32uV \ -101.84uV

These supply currents failed to converge:

I(X_U1B.egnd) = -99.05uA \ -101.56uA
I(V_V2) = -1.229mA \ -1.230mA
I(X_U1A.vc) = 118.64nA \ 175.51nA
I(X_U1B.vb) = -207.82pA \ -329.31pA
I(X_U1B.vc) = -1.932uA \ -3.217uA
I(X_U1B.ve) = 1.932uA \ 3.217uA
I(X_U1B.vlim) = 99.09uA \ 101.61uA

These devices failed to converge:
X_U1A.dc X_U1B.dc X_U1B.fb



Last node voltages tried were:

NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE


(N00258) .1161 (N00266) .2311 (N00279) .0045 (N00292) .1160

(N00307) -2.2692 (N00554) 2.5000 (N02391) 2.7250 (N02471) -2.2750

(X_U1A.6) 1.5026 (X_U1A.7) -4.2997

(X_U1A.8) -4.2997 (X_U1A.9) 0.0000

(X_U1A.a) .0406 (X_U1A.b) -2.2344

(X_U1B.6)-20.78E-06 (X_U1B.7) .2361

(X_U1B.8) .2361 (X_U1B.9) 0.0000

(X_U1B.a) 2.7249 (X_U1B.b)-99.32E-06

(X_U1A.10) -1.6290 (X_U1A.11) -2.2750

(X_U1A.12) -2.1947 (X_U1A.13) -1.6290

(X_U1A.14) -1.6571 (X_U1A.53) 1.2250

(X_U1A.54) -1.4530 (X_U1A.90) -40.6100

(X_U1A.91) 40.0000 (X_U1A.92) -40.0000

(X_U1A.99) .2250 (X_U1B.10) .7237

(X_U1B.11) -2.2352 (X_U1B.12) -2.2354

(X_U1B.13) .7098 (X_U1B.14) .7099

(X_U1B.53) 1.2250 (X_U1B.54) -1.4530

(X_U1B.90) .0991 (X_U1B.91) 40.0000

(X_U1B.92) -40.0000 (X_U1B.99) .2250


**** Interrupt ****

Try relaxing following simulator parameters

ITL4=50, ABSTOL=1n, VNTOL=100u

Look at operating-point capacitances of your diodes and
transistors. Your transistor model params assign no junction
capacitance and if I understand the syntax, only two of the
four diodes are passed a CJ0.

Insanely small node capacitances are a good way to get
transient nonconvergence. I'd also be suspicious of those
switches and how they're connected & parameterized.