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Difference in result with BSIM and PSP models

engrvip

Hi,

I have a receiver testbench consisting of 4 sub-blocks and running HB-HBAC analysis on it to measure VCG (voltage conversion gain). Foundry provides both PSP and BSIM models for FET devices in PDK and recommend to use PSP for RF devices.

But when I run a simulation with BSIM models selected then the results are OK but with PSP incorrect result are coming. Can anyone suggest why this discrepancy might be coming. I am using IC618 and Spectre 19.1 versions.

Thanks!

  • Andrew Beckett

    Presumably there's a difference in the behaviour of the devices. There's no general reason why there should be a problem. Note that there are some known issues with bsim4 models which cause problems with passive mixers, which PSP models don't suffer from, but in that case I would expect the bsim results to be wrong.

    You should contact customer support - understanding this without seeing the circuit and what you're measuring is unlikely to be possible.

    Andrew.

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