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HSPICE model parameter passing

Discussion in 'Electronic Design' started by Subhajit, Jul 26, 2005.

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  1. Subhajit

    Subhajit Guest

    I would like to modify a model parameter of
    a MOSFET while instantiating it
    e.g. threshold voltage parameter
    VTH0 of BSIM3V3 mosfet parameters:

    M1 1 2 3 4 w=10u l=2u VTH0=0.5

    However HSPICE does not allow
    modification of model parameters
    this way. Some other versions of
    Spice do allow this. Is there a
    way out?

    The reason I wish to modify VTH0
    is to run a Monte-Carlo sim for
    threshold voltage mismatches.
  2. Jim Thompson

    Jim Thompson Guest

    Rewrite your model file so that, in the model "card, VTHO='VTChange'

    Then declare PARAM VTChange in a .INCLUDE file.

    PSpice would use VTHO={VTChange}

    ...Jim Thompson
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