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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

    That won't work, because for mismatch to work you have to have parameterised models within the subckt - and in this case you are instantiating cmosn and trying to pass model parameters to the instance of cmosn. vth0 and dvt0 are model parameters, not instance parameters.

    You'd need to use something like:

    subckt NMOS_VTL (D G S B)
    parameters w=350e-9 l=180e-9

    M7 (D G S B) cmosn w=w l=l 

    model cmosn bsim3v3 type=n ...
    + vth0=vth0 dvt0=dvt0 
    + // other parameters
    ends NMOS_VTL

    in other words, put the model inside the subckt, and parameterize the model definition with the global parameters you've specified as having distributions.

    This is covered in the monte carlo modelling guide that I referred to earlier in this thread.

    Regards,

    Andrew.

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  • Andrew Beckett

    That won't work, because for mismatch to work you have to have parameterised models within the subckt - and in this case you are instantiating cmosn and trying to pass model parameters to the instance of cmosn. vth0 and dvt0 are model parameters, not instance parameters.

    You'd need to use something like:

    subckt NMOS_VTL (D G S B)
    parameters w=350e-9 l=180e-9

    M7 (D G S B) cmosn w=w l=l 

    model cmosn bsim3v3 type=n ...
    + vth0=vth0 dvt0=dvt0 
    + // other parameters
    ends NMOS_VTL

    in other words, put the model inside the subckt, and parameterize the model definition with the global parameters you've specified as having distributions.

    This is covered in the monte carlo modelling guide that I referred to earlier in this thread.

    Regards,

    Andrew.

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