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convergence issue

IcoNem

Hi all,

during simulation with ADE L I get the following error: 

(SPECTRE-16927): Transient simulation reaches maximum allowed number of convergence failures below minstep within 5% of stop time.
Change option `max_minstep_nonconv' to adjust the allowed maximum number of convergence failures below minstep.
Last acceptable solution computed at 10.0042 ns.

where is such 'max_minstep_nonconv' parameter set?

Thank you

best regards

  • Andrew Beckett

    It would have to be set in the Setup->Simulation->Options->Analog and then on the Miscellaneous tab go to the Additional Arguments and enter max_minstep_nonconv=500 or whatever number you want (see "spectre -h options" for some coverage of this option).

    I assume you're not setting minstep (it's not a good idea in general). Are  you using a current spectre version (which version are you using)? I've not seen this for some time - it usually is indicative of a convergence problem and was intended to stop spectre getting stuck for a long time with very small time steps which sometimes occur when convergence difficulty occurs.

    Regards,

    Andrew

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