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ERROR -- Convergence problem in transient bias point calculation

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skarthikshines

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hi all i gave my design netlist below can any one tell how to rectify this error?



thanks in advances






**** 05/26/11 16:40:00 ******* PSpice 16.3.0 (June 2009) ****** ID# 0 ********

** Profile: "SCHEMATIC1-t1" [ C:\Documents and Settings\DESIGN\Desktop\proximity ic shortcircuit protection\test-PSpiceFiles\SCHEMA


**** CIRCUIT DESCRIPTION


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




** Creating circuit file "t1.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS

*Libraries:
* Profile Libraries :
* Local Libraries :
* From [PSPICE NETLIST] section of E:\cadence\tools\PSpice\PSpice.ini file:
.lib "E:\cadence\user lib\5KP30A.OLB"
.lib "nom.lib"
.lib "E:\cadence\user lib\OSRAM-IR-METAL CAN(2).lib"

*Analysis directives:
.TRAN 0 1000ns 0
.PROBE V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"



**** INCLUDING SCHEMATIC1.net ****
* source TEST
V_V1 N79014 0 3.3Vdc
V_V2 N00540 0 24Vdc
R_R9 N79014 N00540 4.7k TC=0,0
R_R13 N79164 N79176 1k
Q_T4 N79176 N79022 N00540 BC857B
R_R11 0 N79841 9.8k TC=0,0
C_C9 0 N79164 100nF TC=0,0
R_R12 N79022 N00540 2.2 TC=0,0
Q_Q1 N79841 N79014 N79022 BC857B
D_D1 N79841 N79022 BZX84C33/ZTX

**** RESUMING t1.cir ****
.END

**** 05/26/11 16:40:00 ******* PSpice 16.3.0 (June 2009) ****** ID# 0 ********

** Profile: "SCHEMATIC1-t1" [ C:\Documents and Settings\DESIGN\Desktop\proximity ic shortcircuit protection\test-PSpiceFiles\SCHEMA


**** Diode MODEL PARAMETERS


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




BZX84C33/ZTX
IS 9.428000E-15
N 1.099
IKF 1
BV 33.12
IBV .2024
RS .12
TT 404.000000E-09
CJO 27.620000E-12
VJ .7365
M .3268


**** 05/26/11 16:40:00 ******* PSpice 16.3.0 (June 2009) ****** ID# 0 ********

** Profile: "SCHEMATIC1-t1" [ C:\Documents and Settings\DESIGN\Desktop\proximity ic shortcircuit protection\test-PSpiceFiles\SCHEMA


**** BJT MODEL PARAMETERS


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




BC857B
PNP
LEVEL 1
IS 336.700000E-15
BF 277.7
NF 1
VAF 62.37
IKF .1686
ISE 1.966000E-12
NE 2.123
BR 7.16
NR 1
IKR 9.677
ISC 196.000000E-12
NC 1.815
NK .545
ISS 0
RE 0
RC 2.891
CJE 8.397000E-12
VJE .5
MJE .3865
CJC 11.510000E-12
VJC .5
MJC .3626
XCJC 1
CJS 0
VJS .75
TF 605.900000E-12
XTF 23.02
VTF 10
ITF 2.133
TR 10.000000E-09
XTB 1.5
KF 0
AF 1
CN 2.2
D .52


ERROR -- Convergence problem in transient bias point calculation


Last node voltages tried were:

NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE


(N00540) 3.1095 (N79014) .4276 (N79022) 1.7685 (N79164) 2.8073

(N79176) 2.8073 (N79841) 1.4659


These devices failed to converge:
Q_T4

Try running with .OPTION STEPGMIN

**** Interrupt ****
 

erikl

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Check your netlist!

Check your netlist -- it's not correct. Not even the 2 voltage source nodes show the correct voltage. The collector of T4 is loaded by a series (!) connection of R13 & C9.
 
Last edited:

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