PSpice Non-Inverting Opamp Simulation Convergence Error

  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">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:


"C:\ORCAD\work\preamp\preamp-PSpiceFiles\SCHEMATIC1\preamp\preamp_profile.inc"

                                        ...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">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:


"C:\ORCAD\work\preamp\preamp-PSpiceFiles\SCHEMATIC1\preamp\preamp_profile.inc"

--
Charlie
--
Edmondson Engineering
Unique Solutions to Unusual Problems

 
Thank you both, this solved the problem.

Cheers,
Chris