NMOS model works PMOS doesn't!!

Discussion in 'Cadence' started by Robin, Aug 4, 2004.

  1. Robin

    Robin Guest

    Hello,

    Has anyone gotten the TSMC 0.18 Spectre model files to work on Spectre
    5.0? I managed to simulate all NMOS's, including the 3.3V I/O devices,
    but when I try to simulate PMOS's, spectre complains:

    Warning from spectre at dc = 0 V during DC analysis 'dc'.
    M1: The bulk-source junction current exceeds 'imax'

    The circuit only has one transistor and I am just running the Id/Vds
    characterization curves. It is not a problem with my circuit because
    it works when I simulate with SpectreS.

    The complementary circuit for NMOS works perfectly fine with the
    model.

    Any comment appreciated,

    Is it a bug?

    Thanks in advance,

    Robin Tsang

    Student from UT Austin
     
    Robin, Aug 4, 2004
    #1
  2. Robin

    S. Badel Guest

    Check how you biased the bulk connection of your
    PMOS. it has to be connected to vdd!, not gnd!

    this is not related to the models, at first sight
    at least.

    stéphane
     
    S. Badel, Aug 4, 2004
    #2
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