how does sp work?

Discussion in 'Cadence' started by fredo, Jun 20, 2007.

  1. fredo

    fredo Guest

    hi, does anyone know how the s-parameter simulation (sp) works? i want to
    get the s-parameter at various time instants. thanks
     
    fredo, Jun 20, 2007
    #1
  2. Not sure what you're after when you're asking how it works.

    You can get sp to run at particular times during a transient, by using the
    actimes/acnames parameters of tran (on the tran options form).

    Fill in the sp analysis form as usual in ADE (select your ports, specify the
    frequency range).

    Then on the transient, set your stop time, and then on the options form, specify
    the times you want the sp to run at in the actimes field (space separated). Then
    the acnames field will become ungreyed out, and you can type in "sp" in that
    field.

    If you're trying to look at sp for a linear periodic time variant system (i.e. a
    circuit that translates in frequency), you may want to do SpectreRF's psp
    analysis instead?

    Regards,

    Andrew.
     
    Andrew Beckett, Jun 27, 2007
    #2
  3. fredo

    fredo Guest

    Thanks for the suggestion but there is no actimes/acnames under the option
    form of tran in my ADE. Originally, I wanted to find the s-parameter of my
    circuit under the turned on situation, the turned off situation and while
    switching. Or in other words, I tried to check if the s-parameter obtained
    from sp is in the steady state or just the initial condition or after
    convergence... the circuit is not necessarily linear so I don't think psp
    might be applicable here. Therefore, I wondered whether sp could be made
    dependent to my tran simulation so that I could define it after steady
    state.

    And by the way, will it be accurate for pss to do the similar thing as tran,
    say if pss converges and tran reaches steady state? Will their mere
    difference be a time domain and frequency domain stuff? I mean in terms of
    voltage, current and power.

    Just another question, does every node in tran simulation obey the KVL and
    KCL rule? Because I found weirdly that sometimes they don't. And I just
    treat them as a weird feature in here.

    So a lot of thanks and cheers.
     
    fredo, Jun 28, 2007
    #3
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