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monte-carlo simulation running one seed

frogconsultant

Hi All,

I am using 6.1.5 environment and I have ran a monte-carlo simulation over 100 runs yesterday and I load back my results. Some runs have failed and I wish to see more data on these particulars seeds. I went to the monte-carlo options and choose the specific seed number and re-run only this one with monte-carlo.

As a result, I do not have the correct seed environment and so the same results.

How could I re-run a specific seed number from a monte-carlo run with all data such dc voltage, dc operating point, waveforms specified, ...?

Thanks in advance for your help,

Fabian

Parents

  • Hi Andrew

    I use statistical corners and I can re-produce the same montecarlo run number result when re-run as single statistical corner run on the same cct. What concerns me however is har far can you change your cct before that worst case statistical corner is no longer valid? I understand your flow suggests using statitstical corners to parametric optimize a cct  but is that as long as the letlist doesn't change? Is the seed also related to the netlist? I end up with loads of worst case statistical corners when developing a circuit as the previous worst case statistical corners no longer produce the worst result in a later MC run if the cct has changed. Also grabbing the worst case statistical conrers for a schematic run then extracting the layout and running just the statistical corner extremes gives better results which I am aprehensive about. I still feel I need to run a full MC again as I don't believe the worst case statistical corners are still the worst case.

    Regards

    Lance

Reply

  • Hi Andrew

    I use statistical corners and I can re-produce the same montecarlo run number result when re-run as single statistical corner run on the same cct. What concerns me however is har far can you change your cct before that worst case statistical corner is no longer valid? I understand your flow suggests using statitstical corners to parametric optimize a cct  but is that as long as the letlist doesn't change? Is the seed also related to the netlist? I end up with loads of worst case statistical corners when developing a circuit as the previous worst case statistical corners no longer produce the worst result in a later MC run if the cct has changed. Also grabbing the worst case statistical conrers for a schematic run then extracting the layout and running just the statistical corner extremes gives better results which I am aprehensive about. I still feel I need to run a full MC again as I don't believe the worst case statistical corners are still the worst case.

    Regards

    Lance

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