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Is it possible to save the rational model of the S-parameter block?

Aldo2

Hello,

I'm doing a parametric AC simulation (mmsim 11.1). I need a lot of steps, but the single simulations are fast.

When I add an S-parameter block the parametric simulations slows down because a rational fitting process is required at each simulation step ("Starting rational fitting process." message appears in the output log form).

Is it possible to save the rational model of the S-parameter block? I would like spectre could calculate the rational model only at the beginning of the sweep and then use it on the following sweep steps.

Thank you

Best regards

Aldo

Parents
  • Hi Aldo,
     
    I took a look at your SR.    With Harmonic Balance, use spline or linear interpolation.  Causality correction should be set to fmax. (auto takes forever and only should be used only if fmax doesn't work.)     If the data is non-causal, you *want* causality correction!   The same goes for passivity.  I always turn on passivity checking ...and if the data is non-passive, then I set passivity to enforce.  If the data is passive, then I turn passivity checking off.

    If you follow the guidelines in the nport appNote, you will be fine. Without seeing your s-parameter data, it is difficult to give more solid advice.  (I'm the appNote author and worked with R&D on the most recent update for MMSIM 11.1).

    Best regards,
     
    Tawna
Reply
  • Hi Aldo,
     
    I took a look at your SR.    With Harmonic Balance, use spline or linear interpolation.  Causality correction should be set to fmax. (auto takes forever and only should be used only if fmax doesn't work.)     If the data is non-causal, you *want* causality correction!   The same goes for passivity.  I always turn on passivity checking ...and if the data is non-passive, then I set passivity to enforce.  If the data is passive, then I turn passivity checking off.

    If you follow the guidelines in the nport appNote, you will be fine. Without seeing your s-parameter data, it is difficult to give more solid advice.  (I'm the appNote author and worked with R&D on the most recent update for MMSIM 11.1).

    Best regards,
     
    Tawna
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