how to setup tstab in pss and pdisto

Discussion in 'Cadence' started by Joon, Sep 22, 2004.

  1. Joon

    Joon Guest

    I am simulating a RF Mixer with pdisto analysis.
    In the analysis, I found that tstab is playing very important role. It
    can speed up the simulation and gives very good convergences.
    Can anyone know how to set tstab up? Does it depend on operating
    frequencies, LO and RF, or depend on the Mixer output frequency?
    thanks.
     
    Joon, Sep 22, 2004
    #1
  2. Joon

    Andrew Beckett Guest

    Joon,

    If you're using pdisto, then you are using an old version of the
    software.

    I would definitely recommend using IC5033 or IC5141 (where it is
    called qpss) as the algorithm to do the initial convergence was
    radically improved. tstab behaved a little strangely before that was
    introduced (tstab in PSS is OK, but in pdisto it was problematic).

    I think that most of the algorithm was backported to pdisto/qpss in
    IC446 - something like 4.4.6.500.69 rings a bell.

    Are you using any kind of recent version? That's definitely where I'd
    start first.

    Andrew.
     
    Andrew Beckett, Sep 23, 2004
    #2
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