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PSpice "too many nodes" "not a subcircuit param"

Brad Shelton
Prodigy 70 points
Other Parts Discussed in Thread: TINA-TI

Hi all,

Can someone explain to me what's wrong here? Or let me know what other information you need to help me figure out what going on? I used the LME49710 model in pSPICE, but it gives me these errors: 

WARNING(ORPSIM-15256): <X_U1.XRgn2.ROHMS> not a subcircuit param

WARNING(ORPSIM-15256): <X_U1.XRgnd3.ROHMS> not a subcircuit param

ERROR -- EVALUATION VERSION analog Node Limit (75 Nodes) Exceeded!

I'm using the Lite version of Orcad Capture but I've only placed 5 elements in the circuit I'm trying to simulate. So I'm confused why it's saying the Node limit is exceeded. Maybe it has something to do with the model for the LME49710 audio amp? I've uploaded my .out file as well as a screenshot of the circuit I'm trying to simulate.

HiFi Amp.txt
Fullscreen
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**** 08/28/16 19:26:38 ****** PSpice Lite (October 2012) ****** ID# 10813 ****
** Profile: "SCHEMATIC1-HiFi Amp" [ C:\OrCAD\ECE 2280\guitaramp-pspicefiles\schematic1\hifi amp.sim ]
**** CIRCUIT DESCRIPTION
******************************************************************************
** Creating circuit file "HiFi Amp.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS
*Libraries:
* Profile Libraries :
* Local Libraries :
.LIB "../../../lme49710.lib"
* From [PSPICE NETLIST] section of C:\Users\brads_000\AppData\Roaming\SPB_16.6\cdssetup\OrCAD_PSpice/16.6.0/PSpice.ini file:
.lib "nomd.lib"
*Analysis directives:
.TRAN 0 1000ns 0
.OPTIONS ADVCONV
.PROBE64 V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"
**** INCLUDING SCHEMATIC1.net ****
* source GUITARAMP
X_U1 N14613 GND N14493 N14505 N14777 LME49710
V_V1 GND N14505 25Vdc
V_V2 GND N14493 25Vdc
V_V3 N14613 N14604 AC 1
+SIN 0 150mV 1500Hz 0 0 0
R_R1 N14777 N14758 8 TC=0,0
**** RESUMING "HiFi Amp.cir" ****
.END
WARNING(ORPSIM-15256): <X_U1.XRgn2.ROHMS> not a subcircuit param
WARNING(ORPSIM-15256): <X_U1.XRgnd3.ROHMS> not a subcircuit param
ERROR -- EVALUATION VERSION analog Node Limit (75 Nodes) Exceeded!
ABORTING SIMULATION·
**** 08/28/16 19:26:38 ****** PSpice Lite (October 2012) ****** ID# 10813 ****
** Profile: "SCHEMATIC1-HiFi Amp" [ C:\OrCAD\ECE 2280\guitaramp-pspicefiles\schematic1\hifi amp.sim ]
**** JOB STATISTICS SUMMARY
******************************************************************************
Node counts:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
trying to simulate.

  • 0
    TI__Mastermind 41310 points

    Brad,

    If you take a look at the log file, the number of nodes in your circuit is 97. The LME49710 has many internal nodes that are also part of the count. The evaluation version of PSpice is very difficult to use with any complex subcircuit IC model as most of the nodes will be used up with the nodes of the internal model. The evaluation version was not intended to be used with these kind of circuits, but rather for instructional or basic circuits.

    The Warning for ROHM is due to a typo (it appears) in the model for RNOISELESS which should use R instead of ROHM. You can change that in the .lib file by substituting R for ROHM in the PARAMS statement.

  • 0 in reply to Britt Brooks - Online Design Tools
    TI__Mastermind 41310 points

    Brad,

    You might consider using TINA-TI, TI's free simulation tool. It doe snot have any node limitations and is a complete simulation tool that you can download for free (http://www.ti.com/tool/tina-ti/) . Our PSpice models can be easily imported into TINA-TI and we have thousands of reference designs for it.