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How to change the transient noise seed for each sample in a Monte Carlo simulation?

DomiHammerfall

Dear community

I would like to run a Monte Carlo Analysis where the seed for the transient noise analysis is changed (randomly) at every sample.

There is this 10 year old forum thread (klick here to open) that explains a workaround for achieving this. This workaround still works as of today (February 2024). However, is there not a proper way of doing this?

For example, the Spectre user manual describes a transient noise parameter called mc_auto_noiseseed which "regenerates the seed at every monte carlo iteration". This option seems not accessible through the user interface, and inserting it as additional parameter is the Misc tab of the transient option form (see below) does not seem to work; the seed is the same for every sample according to the log files.

So what is the "correct" way of doing this?

Thanks for every suggestion.

Parents

  • There was a conflict that if the netlist contained both mc_auto_noiseseed and noiseseed then the value of noiseseed won and so the mc_auto_noiseseed=yes had no effect.

    This was fixed fairly recently, in SPECTRE21.1 ISR21 and SPECTRE23.1 ISR1. I'm guessing you're using too old a version of Spectre (this was mid-2023 that it was fixed).

    Andrew

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  • There was a conflict that if the netlist contained both mc_auto_noiseseed and noiseseed then the value of noiseseed won and so the mc_auto_noiseseed=yes had no effect.

    This was fixed fairly recently, in SPECTRE21.1 ISR21 and SPECTRE23.1 ISR1. I'm guessing you're using too old a version of Spectre (this was mid-2023 that it was fixed).

    Andrew

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