pspice convergence problem in bias point

how do i overcome this?
even when i change the bias, it still doesn't works
could someone show me the correct steps?

I am not sure that pins 2 & 3 look correct. Check which one is really the inventing input and that you model/symbol is correct.

Keith

i changed the pins..

**** 12/18/13 14:20:15 ************** PSpice Lite (Mar 2000) *****************

** Profile: "SCHEMATIC1-kop" [ C:\Program Files\OrcadLite\miniproject-SCHEMATIC1-kop.sim ]


**** CIRCUIT DESCRIPTION


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




** Creating circuit file "miniproject-SCHEMATIC1-kop.sim.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS

*Libraries:
* Local Libraries :
* From [PSPICE NETLIST] section of C:\Program Files\OrcadLite\PSpice\PSpice.ini file:
.lib "nom.lib"

*Analysis directives:
.OPTIONS STEPGMIN
.OPTIONS ABSTOL= 10p
.OPTIONS RELTOL= 0.01
.OPTIONS VNTOL= 1u
.PROBE V(*) I(*) W(*) D(*) NOISE(*)
.INC ".\miniproject-SCHEMATIC1.net"



**** INCLUDING miniproject-SCHEMATIC1.net ****
* source MINIPROJECT
R_R7 N01243 N00774 1198
R_R2 N00941 N01012 1846
V_Vcc N00484 GND 12Vdc
X_U1 N00801 N02859 N00484 N00592 N00638 uA741
R_R3 N00638 N00941 625
V_Vee GND N00592 12Vdc
R_R4 N00774 N00638 500
D_D2 N00774 N00801 D1N4148
V_Va N01012 GND 15Vdc
R_RF N00801 N00638 50k
D_D1 N00801 N00941 D1N4148
R_R6 N01313 N00801 12.5k
V_Vb GND N01243 15Vdc
R_R5 GND N02859 10k
V_V4 N01313 GND DC 6Vdc AC 1Vac

**** RESUMING miniproject-SCHEMATIC1-kop.sim.cir ****
.END

**** 12/18/13 14:20:15 ************** PSpice Lite (Mar 2000) *****************

** Profile: "SCHEMATIC1-kop" [ C:\Program Files\OrcadLite\miniproject-SCHEMATIC1-kop.sim ]


**** Diode MODEL PARAMETERS


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




D1N4148 X_U1.dx
IS 2.682000E-09 800.000000E-18
N 1.836
ISR 1.565000E-09
IKF .04417
BV 100
IBV 100.000000E-06
RS .5664 1
TT 11.540000E-09
CJO 4.000000E-12
VJ .5
M .3333


**** 12/18/13 14:20:15 ************** PSpice Lite (Mar 2000) *****************

** Profile: "SCHEMATIC1-kop" [ C:\Program Files\OrcadLite\miniproject-SCHEMATIC1-kop.sim ]


**** BJT MODEL PARAMETERS


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




X_U1.qx
NPN
IS 800.000000E-18
BF 93.75
NF 1
BR 1
NR 1
CN 2.42
D .87


ERROR -- Convergence problem in bias point calculation


Last node voltages tried were:

NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE


( GND) 5.239E+06 (N00484) 5.239E+06 (N00592) 5.239E+06 (N00638) 5.239E+06

(N00774) 5.239E+06 (N00801) 5.239E+06 (N00941) 5.239E+06 (N01012) 5.239E+06

(N01243) 5.239E+06 (N01313) 5.239E+06 (N02859) 5.239E+06 (X_U1.6) -5.3746

(X_U1.7) 5.239E+06 (X_U1.8) 5.239E+06 (X_U1.9) 0.0000 (X_U1.10) 5.239E+06

(X_U1.11) 5.239E+06 (X_U1.12) 5.239E+06

(X_U1.13) 5.239E+06 (X_U1.14) 5.239E+06

(X_U1.53) 5.239E+06 (X_U1.54) 5.239E+06

(X_U1.90) 4.2303 (X_U1.91) 39.5690

(X_U1.92) -39.5690 (X_U1.99) 5.183E+06


These supply currents failed to converge:

I(X_U1.egnd) = -805.69pA \ -722.90pA

You have no node zero, probably because you have used the wrong GND symbol. Change your GND symbol for the correct one or add a zero voltage source or zero ohm resistor from GND to node zero.

Keith

It works fine for me after correcting the GND


**** 12/30/13 21:11:40 ****** PSpice Lite (October 2012) ****** ID# 10813 ****

**** INCLUDING miniproject-SCHEMATIC1.net ****


**** CIRCUIT DESCRIPTION


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



* source MINIPROJECT
R_R7 N01243 N00774 1198
R_R2 N00941 N01012 1846
V_Vcc N00484 0 12Vdc
X_U1 N00801 N02859 N00484 N00592 N00638 uA741
R_R3 N00638 N00941 625
V_Vee 0 N00592 12Vdc
R_R4 N00774 N00638 500
D_D2 N00774 N00801 D1N4148
V_Va N01012 0 15Vdc
R_RF N00801 N00638 50k
D_D1 N00801 N00941 D1N4148
R_R6 N01313 N00801 12.5k
V_Vb 0 N01243 15Vdc
R_R5 0 N02859 10k
V_V4 N01313 0 DC 6Vdc AC 1Vac

**** RESUMING miniproject-SCHEMATIC1-kop.sim.cir ****
.Tran 1u 1m
.lib
.probe
.END

**** 12/30/13 21:11:40 ****** PSpice Lite (October 2012) ****** ID# 10813 ****

**** INCLUDING miniproject-SCHEMATIC1.net ****


**** Diode MODEL PARAMETERS


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




D1N4148 X_U1.dx
IS 2.682000E-09 800.000000E-18
N 1.836
ISR 1.565000E-09
IKF .04417
BV 100
IBV 100.000000E-06
RS .5664 1
TT 11.540000E-09
CJO 4.000000E-12
VJ .5
M .3333


**** 12/30/13 21:11:40 ****** PSpice Lite (October 2012) ****** ID# 10813 ****

**** INCLUDING miniproject-SCHEMATIC1.net ****


**** BJT MODEL PARAMETERS


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




X_U1.qx
NPN
LEVEL 1
IS 800.000000E-18
BF 93.75
NF 1
BR 1
NR 1
ISS 0
RE 0
RC 0
CJE 0
VJE .75
CJC 0
VJC .75
MJC .33
XCJC 1
CJS 0
VJS .75
KF 0
AF 1
CN 2.42
D .87


**** 12/30/13 21:11:40 ****** PSpice Lite (October 2012) ****** ID# 10813 ****

**** INCLUDING miniproject-SCHEMATIC1.net ****


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


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



NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE


(N00484) 12.0000 (N00592) -12.0000 (N00638) -6.0481 (N00774) -8.6841

(N00801)-850.4E-06 (N00941) -.5567 (N01012) 15.0000 (N01243) -15.0000

(N01313) 6.0000 (N02859)-798.0E-06 (X_U1.6) 623.3E-06 (X_U1.7) -6.2298

(X_U1.8) -6.2298 (X_U1.9) 0.0000 (X_U1.10) -.6085

(X_U1.11) 11.9600 (X_U1.12) 11.9600

(X_U1.13) -.5946 (X_U1.14) -.5946

(X_U1.53) 11.0000 (X_U1.54) -11.0000

(X_U1.90) -3.6352 (X_U1.91) 40.0000

(X_U1.92) -40.0000 (X_U1.99) 0.0000




VOLTAGE SOURCE CURRENTS
NAME CURRENT

V_Vcc -1.337E-03
V_Vee -1.337E-03
V_Va -8.427E-03
V_Vb -5.272E-03
V_V4 -4.801E-04
X_U1.vb 6.233E-09
X_U1.vc 1.705E-11
X_U1.ve 4.953E-12
X_U1.vlim -3.635E-03
X_U1.vlp -4.364E-11
X_U1.vln -3.637E-11

TOTAL POWER DISSIPATION 2.40E-01 WATTS



JOB CONCLUDED

**** 12/30/13 21:11:40 ****** PSpice Lite (October 2012) ****** ID# 10813 ****

**** INCLUDING miniproject-SCHEMATIC1.net ****


**** JOB STATISTICS SUMMARY


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



Total job time (using Solver 1) = .02