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How to add mismatch to Monte Carlo design variables?

Hubertastra

Hi,

I would like to run a monte carlo simulation with design variables in ADE-XL. I read one useful previous question in the forum:

https://community.cadence.com/cadence_technology_forums/f/custom-ic-design/38316/monte-carlo-design-variables.

But I found it can only work for process variation. My question is how to add mismatch variation in the spectre model to allow mismatch Monte Carlo simulation on design variable or any other way to do that.

Thank you,

Yang

Parents

  • Hi Yang,

    In general, to model mismatch, you need to have the component inside a subckt (often done with an inline subckt). See https://designers-guide.org/modeling/montecarlo.pdf . There is another way, which is to add an option (in ADE, under Simulation->Options->Analog, in the miscellaneous tab, in the Additional Arguments field (I think that's what it's called from memory) at the bottom - you can type mismatchlevel=1 . The downside of this approach is that it may cause mismatch models from a foundry to misbehave (in some cases) if they are using the traditional way of handling mismatch as described in the PDF I pointed you to.

    BTW, I deleted your other post asking the same thing on an old thread (the forum guidelines ask you not to post on old threads or ask the same question more than once, so I thought it best to consolidate on this thread).

    Regards,

    Andrew.

Reply

  • Hi Yang,

    In general, to model mismatch, you need to have the component inside a subckt (often done with an inline subckt). See https://designers-guide.org/modeling/montecarlo.pdf . There is another way, which is to add an option (in ADE, under Simulation->Options->Analog, in the miscellaneous tab, in the Additional Arguments field (I think that's what it's called from memory) at the bottom - you can type mismatchlevel=1 . The downside of this approach is that it may cause mismatch models from a foundry to misbehave (in some cases) if they are using the traditional way of handling mismatch as described in the PDF I pointed you to.

    BTW, I deleted your other post asking the same thing on an old thread (the forum guidelines ask you not to post on old threads or ask the same question more than once, so I thought it best to consolidate on this thread).

    Regards,

    Andrew.

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