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MonteCarlo simulations

Ueue

Dear all,

In my process I don't have the mismatch information in the section mismatch of the models.

Therefore, I cannot perform MC simulations for mismatch, but only for process variations.

In particular, in the section mismatch, I have these unsignificant (at least to me) lines:

mismatch {

vary parn1 dist=gauss std=1/1vary parn2 dist=gauss std=1/1

vary parp1 dist=gauss std=1/1

vary parp2 dist=gauss std=1/1

}

Since I have the information about mean value and standard deviation of the threshold voltage of the MOS I use, Is there a way to insert in the model this information, and to allow me to perform MC simulations?

Thanks a lot,

Stefano

  • Andrew Beckett

    Hi Stefano,

    I'm slightly confused, as you say you don't have mismatch information, but then you show a mismatch section! It's possible that these are simple gaussian distributions which are then scaled within the models. For mismatch to work, the model needs to be parameterized and inside a subckt (often an inline subckt) - if the parameterized model is referencing these parameters parn1/parp1 etc then it should get some mismatch.

    See http://www.designers-guide.org/Modeling/montecarlo.pdf (the same document is on Cadence Online Support ).

    Regards,

    Andrew.

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