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Making a monte carlo simulation component specific

simbamford
Does anyone know how to specify that for a monte carlo mismatch simulation (presumably using spectre though I also have an ultrasim license), one or two specific transistors will not be subject to mismatch, i.e. will give nominal performance, whilst every other component will be subject to mismatch? Of course it would be convenient if this were possible through the virtuoso inferface, but any method would be useful.Any help gratefully received. 
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  • Andrew Beckett

    Yes. Type "spectre -h montecarlo" and you'll see:

    10      ignore=[...]      If set, no variation is applied to specified subcircuit instances. In
                              addition, all subcircuits instantiated under this instance do not have
                              variation enabled. By default, mismatch is applied to all subcircuit
                              instances in the design and the process is applied globally.

    So you can specify on the montecarlo analysis statement ignore=[I1 I2 I3] etc.

    Andrew.

  • MYatNEU
    in reply to Andrew Beckett

    Hi Andrew, I have one quick question related to this: does it also apply to process variations? In IC615, we can specify the instance for mismatch in ADE XL "Run Monte Carlo Sampling", however, there's no option for process. Therefore, if I want to ignore PV for specific instances in my test bench, how can I do that? Thanks!

  • Andrew Beckett
    in reply to MYatNEU

    Not currently. There's a change request (CCR 2017541) related to this in the system, but it's not been implemented yet (I think spectre may have the capability - although there are some slight gaps at the moment - but it's not available through the user interface, even in the current IC618 release rather than the rather old version you're using).

    Regards,

    Andrew.

  • MYatNEU
    in reply to Andrew Beckett

    Hi Andrew, thanks for the quick reply, you're amazing!

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  • MYatNEU
    in reply to Andrew Beckett

    Hi Andrew, thanks for the quick reply, you're amazing!

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