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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

    For various historical reasons there are two flows in Virtuoso - an analog-centric and a digital-centric flow. Most design kits are set up to use the analog flow, including gpdk180. From the error you've got (which is complaining about not being able to find "lvs" views), you've probably got the "digital" flow enabled; if using the analog flow, it looks for "auLvs" views as it's using the auLvs netlister.

    So, make sure you do:

    setenv CDS_Netlisting_Mode Analog

    (if using csh) or:

    export CDS_Netlisting_Mode=Analog

    (if using bash/ksh) as your shell.

    Do this before you start virtuoso.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    For various historical reasons there are two flows in Virtuoso - an analog-centric and a digital-centric flow. Most design kits are set up to use the analog flow, including gpdk180. From the error you've got (which is complaining about not being able to find "lvs" views), you've probably got the "digital" flow enabled; if using the analog flow, it looks for "auLvs" views as it's using the auLvs netlister.

    So, make sure you do:

    setenv CDS_Netlisting_Mode Analog

    (if using csh) or:

    export CDS_Netlisting_Mode=Analog

    (if using bash/ksh) as your shell.

    Do this before you start virtuoso.

    Regards,

    Andrew.

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