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Convergence problem

Shobhitkareer

Hi,

Im trying to simulate a circuit but its showing me  convergence error and bad pivot, so I checked yes for the dc_pivot _check (simulation-> options-> analog)  but the error still persist.

Also, I found a spice file which may solve the convergence problem, how can I add it to the spectre simulation

Im using IC6.17 and mmsim15.10.801

thank you

Regards

shobhit

  • Andrew Beckett

    Hi Shobhit,

    I don't really understand what you mean. What do you mean by "I found a spice file which may solve the convergence problem" - what is this "spice file" supposed to do?

    Your question rather unclear - I've no idea why a "spice file" would help solve a convergence problem.

    Regards,

    Andrew.

  • Shobhitkareer
    in reply to Andrew Beckett

    sorry Andrew for a vague question, its actually .option statements in SPICE

    .options POST 

    .options INGOLD=1 DCON=3 
    .options GSHUNT=1e-11 RMIN=1e-16

    I read the manual and try to find the analogous for this but couldnt find it.

    regards

    shobhit

  • Andrew Beckett
    in reply to Shobhitkareer

    Those options are for HSPICE, not for spectre. POST, DCON and RMIN are not understood by spectre (POST wouldn't help anyway because it's controlling the output format in HSPICE), and whilst GSHUNT is supported in spectre,  it's not a very commonly used way to solve convergence problems (in fact I've never seen it used). The ingold option is semi-supported, but all it does is affect the output format in the textual output files - nothing to do with convergence.

    In general, trying to port convergence options from one simulator to another is a bad idea - it almost certainly won't help as the methods used in each simulator is different.

    I suggest you contact customer support so you can provide some more details on the specifics of your actual convergence issue.

    Regards,

    Andrew.

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