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Monte Carlo simulation for device mismatch

sdineshkumar

I am trying to simulate a SRAM PUF in cadence 5.1. I want to create threshold variations between two back to back connected inverters. I decided to vary threshold of any one of the PMOS . I want to apply monte carlo simulation with guassian distribution to any one of the PMOS. I dont know  how to apply montecarlo variation to a particular PMOS?

Is there any way to do it in virtuoso 5.1

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  • Andrew Beckett

    The problem is that in your subcircuit:

    subckt NMOS2 (n3 n2 n0 n1)
    parameters Ndelvt0=0
    N0 (n3 n2 n0 n1) nmos l=45n w=45n delvto = Ndelvt0

    ...

    The parameters line should not be there. This is masking the global parameter that you have the statistical variation on - and so there ends up being no variation at all within this subcircuit. If you remove this parameters line (or comment it out), then it works as you're expecting (I checked).

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    The problem is that in your subcircuit:

    subckt NMOS2 (n3 n2 n0 n1)
    parameters Ndelvt0=0
    N0 (n3 n2 n0 n1) nmos l=45n w=45n delvto = Ndelvt0

    ...

    The parameters line should not be there. This is masking the global parameter that you have the statistical variation on - and so there ends up being no variation at all within this subcircuit. If you remove this parameters line (or comment it out), then it works as you're expecting (I checked).

    Regards,

    Andrew.

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