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pss simulation issues

Binhngo1210

Hi everybody, 

i am dealing with the pss/psp simulation that employs a high-frequency clock divider in the testbench. 

the pss simulation shows up the warning like "limiting signal :...... " (<fig.1>) that is abnormal to what I've seen with pss simulation. what kind of warnings stands for? and any hints on how to make it clean? 

the spectre log file summaries the convergence failures <fig.2>, even at the end, "conv norm" approaches to smaller than 1. I don't really get the mechanism here. could you help me to explain this point? 

Finally, simulation goes through to PSP to get S parameter responses, however, sometimes it got stuck at a frequency and terminated simulation with long codes <fig.3> . what would be the reason, could anyone know the reason? 

Ps: My version IC617 , spectre 616 and my simulation options are configured as <fig.4> 

thanks for your time !

<fig.1> 

<fig.2> 

<fig.3> 

<fig.4> 

Parents

  • OK, the first two are because you've turned on the +diagnose option (which might be via the "Enable Diagnostic Mode" on the Setup->Environment form, or via the "User Command-Line Options" field on the same form, or might possibly be via the "diagnose" checkbox on the Check tab of the Simulation->Options->Analog form. This is additional information to help diagnose performance issues during DC/transient type simulations, and doesn't necessarily indicate a problem - it's just telling you more information about when it had to take action to adjust the time steps for some reason, either because some signal was changing too quickly (limiting) or because of temporary convergence failure. It's useful if you find there are convergence problems, or slow performance, but other than that, if you don't want to see it, don't turn on the diagnostics...

    The other issue with PSP crashing is likely a bug, and the message tells you to contact customer support ( this forum is not customer support). I would start by checking again with a newer version of Spectre than the 5-year old version you're using!

    Regards,

    Andrew

  • in reply to Andrew Beckett

    It is pretty nice. I got the reason. 

    For number 3, i changed the step of freq and it works out. Dont really get the culprit. I hope i could update the most recent spectre but i am not admin of server. Anyway, thanks for answer 

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