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PTRANABSTOL and PTRANVNTOL - PSPICE for TI

Jason Haedt
Expert 4220 points

Hello,

I am working on a simulation and PSPICE for TI is saying that I can improve pseudotransient convergence by setting these two parameters.  I can't exactly where these two settings are.  I see similar settings in the simulation profile called ABSTOL and VNTOL but no settings with the full name of PTRANABSTOL and PTRANVNTOL.  Any suggestions on where to modify these?  

-Jason 

  • 0
    TI__Expert 5880 points

    Hello Jason,

    PTRANABSTOL and PTRANVNTOL are advanced settings to aid the simulator with convergence by loosening the tolerances. They are documented in the PSpice reference guide, but not in the user guide. Please be aware that by increasing these values, it could reduce the accuracy of the simulation, particularly at the initial time step. 

    Please download the attached file, include.txt. Please open your design in PSpice for TI. To attach the include file to the sim profile, click Edit Simulation Profile. Choose “Configuration Files.” From here, you can click “Browse…” and navigate to the include.txt file that you have saved. Click Add to Profile, and you should see it appear on the list of Configured Files. Now click OK and try running the simulation again.

    If it still fails to converge, you can increase these values by one or two orders of magnitude. You could also try the "Autoconvergence" options in the Simulation Profile Settings. As noted, please be aware that this could decrease the accuracy of the simulation. 

    Thank you,

    Jackie

  • 0 in reply to Jackie Horn
    TI__Expert 4220 points

    Jackie,

    I don't see an include.txt file. Can you reattach?

  • 0 in reply to Jason Haedt
    TI__Expert 5880 points

    Hello Jason,

    My mistake. Here it is:

    1234.include.txt
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    1
    2
    + .options PTRANABSTOL 1e-5
    + .options PTRANNVTOL 1e-4
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  • 0 in reply to Jackie Horn
    TI__Expert 5880 points

    Hello Jason,

    It appears the formatting has changed in the more recent versions. Please see the attached file with the updated include.txt:

    6763.include.txt
    Fullscreen
    1
    + .options PTRANABSTOL=1e-4 PTRANVNTOL=1e-3
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX