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Random values assigned to parameters in multiple devices with Monte Carlo definition

Dear all,

I have a question on the random value assignment to parameters in multiple devices when doing MC simulations. If I have several devices in my circuit, the assignment of a random value is only done once, then used several times. Thus, it seems that the same parameter value will be assigned to all devices referencing that model. But in reality, I want each device used different parameter values following one distributions during MC simulations.

In HSPICE, there is one code '.OPTION MODMONTE = 1' which can overcome this issue. Its function is shown in the attached figure from HSPICE cmd user guide. What I am doing now is to use Spectre to run models written in HSPICE and adding the above code into the model, typically in .lib files. I just wonder if the same opertion can be done directly in Spectre when we set up MC simulations (where my MC distribution setting is written in .scs).

Thanks a lot for your help.

Best regards,

Andrew Beckett over 2 years ago

Take a look at https://designers-guide.org/modeling/montecarlo.pdf (the same document in another form was on our support site, but is in the process of being refreshed, I believe).
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Elrond over 2 years ago in reply to Andrew Beckett

Dear Andrew,

Great thanks to your reply. With the shared doc, we understood more clearly the MC simulation settings and realized what we wanted, although we still have questions on the 'correlation' function. But it really helps us a lot.

Best regards,

Elrond
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