A
Apparatus
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:
http://www.its.caltech.edu/~hiszpans/preamp.zip
The model uses an OPA134, created by following the instructions at:
http://focus.ti.com/lit/an/sloa070/sloa070.pdf
and using the SPICE model provided by TI for the OPA134.
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 ****
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:
http://www.its.caltech.edu/~hiszpans/preamp.zip
The model uses an OPA134, created by following the instructions at:
http://focus.ti.com/lit/an/sloa070/sloa070.pdf
and using the SPICE model provided by TI for the OPA134.
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 ****
