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 BSIM4 cadence implementation 

Last post Wed, Jul 11 2012 1:23 AM by soathana. 2 replies.
Started by soathana 04 Jul 2012 06:25 AM. Topic has 2 replies and 2203 views
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  • Wed, Jul 4 2012 6:25 AM

    • soathana
    • Top 500 Contributor
    • Joined on Fri, Jan 13 2012
    • Posts 24
    • Points 375
    BSIM4 cadence implementation Reply

    Hi everyone.

    Is BSIM4 model implemented in cadence is anyhow different from the official one specified by BSIM group?

    This derives from comparing a verilog-a model released from another company also implementing BSIM4 also against the cadence one and the results are somehow different.

    For example parameters like PUA,PUB,WUB,WUC are not listed in BSIM4 2010 version manual but they appear on spectre manual. Usually for a model card (umc 90 for example) these are listed under other parameters.

    Any ideas? 

    Thanks,

    Sotiris 

    • Post Points: 20
  • Wed, Jul 4 2012 9:38 AM

    Re: BSIM4 cadence implementation Reply

    Sotiris,

    This is a failing of the veriloga model you're using and the BSIM4 manual. If you look at the code from the bsim site:

    http://www-device.eecs.berkeley.edu/~bsim/Files/BSIM4/BSIM470/BSIM470_Code.tar

    It contains a definition of these parameters. So they're in the BSIM groups source code...

    There are potentialy a few deviations from the official code, usually to add some additional features requested by specific customers (primarily a certain large foundry), but those wouldn't alter the default behaviour of the model unless those specific parameters/values were used ("spectre -h bsim4" lists these and makes it fairly clear they are specific to a particular foundry). But overall, there should be very good correlation with the BSIM group's code.

    Andrew.

    • Post Points: 20
  • Wed, Jul 11 2012 1:23 AM

    • soathana
    • Top 500 Contributor
    • Joined on Fri, Jan 13 2012
    • Posts 24
    • Points 375
    Re: BSIM4 cadence implementation Reply
    Thanks Andrew!
    • Post Points: 5
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Started by soathana at 04 Jul 2012 06:25 AM. Topic has 2 replies.