g_m * r_ds determination with Analog environment

Discussion in 'Cadence' started by J. Patrick Bedell, Sep 30, 2008.

  1. J. Patrick Bedell

    J. Patrick Bedell Guest

    Hello,
    I am using DFII 5.0.41 to determine the behavior of PMOSFETs and
    NMOSFETS for varying V_ds and V_gs. I am sweeping V_gs and using
    parametric analysis to vary V_ds, so that I can find g_m for various
    values of V_ds. I would like to find g_m and r_ds simultaneously in
    the Analog environment, but I only know how to use math functions on
    the curve that is being swept in the initial analysis (in this case
    V_gs), and I'm not sure how to use waveform analysis on the results of
    the parametric analysis.
    Can anyone help me to determine g_m * r_ds within the analog
    environment?
    Thanks!

    Patrick
    jpbedell@gmail
     
    J. Patrick Bedell, Sep 30, 2008
    #1
  2. J. Patrick Bedell

    Riad KACED Guest

    Hi Parick,

    Have you ever looked at doing it with an ocean acripts ?
    The data you are loking for are actually available from the dcOp
    analysis.
    There are some examples in this forum, please make a search. There is
    one thread for you.
    http://groups.google.com/group/comp...d9b9?lnk=gst&q=gm+parametric#bf4b2153b670d9b9

    Assuming have understood your question.
    Otherwise, Please don't hesitate to back again.

    Hope this help anyway.
    Cheers,
    Riad.
     
    Riad KACED, Sep 30, 2008
    #2
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