Hello,
I'm trying to model a very basic non-inverting amplifier using a Burr-Brown OPA134 opamp using OrCAD PSpice A/D 10.0 Demo, freely available from OrCAD's website.
I have zipped my design and put it up on:
The model uses an OPA134, created by following the instructions at:
The model also uses a 1k and a 10k resistor for the feedback network and a VAC source (Vac = 1, Vdc = 0) as input to the non-inverting input of the opamp.
I have played around with the simulation of this circuit for a while now, but I keep getting the following (entire PSpice output file follows):
What could the problem be?
Chris
**** 09/16/04 13:13:25 ************** PSpice Lite (Jan 2003)
*****************
** Profile: "SCHEMATIC1-preamp" [ C:\\ORCAD\\work\\preamp\\preamp-PSpiceFiles\\SCHEMATIC1\\preamp.sim ]
**** CIRCUIT DESCRIPTION
******************************************************************************
** Creating circuit file "preamp.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS
*Libraries:
- Profile Libraries : ..INC "C:\ORCAD\work\preamp\preamp-PSpiceFiles\SCHEMATIC1\preamp\preamp_profile.inc"
- Local Libraries :
**** INCLUDING preamp_profile.inc **** ..STMLIB ".\\preamp.stl"
**** RESUMING preamp.cir **** ..LIB "C:/orcad/orcad_10.0_demo/tools/pspice/library/eval.lib" ..LIB "C:/orcad/orcad_10.0_demo/tools/pspice/UserLib/opa134.lib"
- From [PSPICE NETLIST] section of C:\orcad\orcad_10.0_demo\tools\PSpice\PSpice.ini file: ..lib "nom.lib"
*Analysis directives: ..AC DEC 100 100 1000000 ..OPTIONS STEPGMIN ..PROBE V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*)) ..INC "..\\SCHEMATIC1.net"
**** INCLUDING SCHEMATIC1.net ****
- source PREAMP V_V1 N08548 GND_POWER DC 0Vdc AC 1Vac V_V2 GND_POWER N092391 20Vdc R_R1 GND_POWER N08368 1k V_V3 N092720 GND_POWER 20Vdc R_R2 N08368 N08386 10k X_U1 N08548 N08368 N092720 N092391 N08386 OPA134
**** RESUMING preamp.cir **** ..END
**** 09/16/04 13:13:25 ************** PSpice Lite (Jan 2003)
*****************
** Profile: "SCHEMATIC1-preamp" [ C:\\ORCAD\\work\\preamp\\preamp-PSpiceFiles\\SCHEMATIC1\\preamp.sim ]
**** Diode MODEL PARAMETERS
******************************************************************************
X_U1.DX IS 800.000000E-18
**** 09/16/04 13:13:25 ************** PSpice Lite (Jan 2003)
*****************
** Profile: "SCHEMATIC1-preamp" [ C:\\ORCAD\\work\\preamp\\preamp-PSpiceFiles\\SCHEMATIC1\\preamp.sim ]
**** Junction FET MODEL PARAMETERS
******************************************************************************
X_U1.JX PJF VTO -1 BETA 1.010000E-03 IS 2.500000E-15
ERROR -- Convergence problem in bias point calculation
Last node voltages tried were:
NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE
(N08368)-10.00E+09 (N08386)-10.00E+09 (N08548)-10.00E+09 (X_U1.6) ..0044
(X_U1.7)-10.00E+09 (X_U1.8)-10.00E+09 (X_U1.9) 0.0000 (N092391)-10.00E+09
(N092720)-10.00E+09 (X_U1.10)-10.00E+09
(X_U1.11)-10.00E+09 (X_U1.12)-10.00E+09
(X_U1.53)-10.00E+09 (X_U1.54)-10.00E+09
(X_U1.90) -.0461 (X_U1.91) 40.0000
(X_U1.92) -40.0000 (X_U1.99)-10.00E+09
(GND_POWER)-10.00E+09
These voltages failed to converge:
V(N08548) = -10.00GV \\ -10.00GV V(GND_POWER) = -10.00GV \\ -10.00GV V(N092391) = -10.00GV \\ -10.00GV V(N08368) = -10.00GV \\ -10.00GV V(N092720) = -10.00GV \\ -10.00GV V(N08386) = -10.00GV \\ -10.00GV V(X_U1.11) = -10.00GV \\ -10.00GV V(X_U1.12) = -10.00GV \\ -10.00GV V(X_U1.7) = -10.00GV \\ -10.00GV V(X_U1.10) = -10.00GV \\ -10.00GV V(X_U1.99) = -10.00GV \\ -10.00GV V(X_U1.53) = -10.00GV \\ -10.00GV V(X_U1.54) = -10.00GV \\ -10.00GV V(X_U1.8) = -10.00GV \\ -10.00GV
**** Interrupt ****