PSpice Non-Inverting Opamp Simulation Convergence Error

A

Apparatus

Guest
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 ****
 
You have no node 0 (zero)

Add a ground symbol

On 16 Sep 2004 13:17:16 -0700, apparatus.home@lycos.com (Apparatus)
wrote:

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 ****
Click to expand...

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
You need a 0 (ground) symbol out of the source library. That is the
only ground that works for simulation in Capture. Or, just rename the
ground symbol you used to 0.


Apparatus wrote:

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 ****
Click to expand...
--
Charlie
--
Edmondson Engineering
Unique Solutions to Unusual Problems
 
Charles Edmondson <edmondson@ieee.org> wrote in message news:<414a0e2f$1@news.cadence.com>...
You need a 0 (ground) symbol out of the source library. That is the
only ground that works for simulation in Capture. Or, just rename the
ground symbol you used to 0.
Click to expand...
Thank you both, this solved the problem.

Cheers,
Chris
 
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