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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

  • Aldo,

    Using the rational model is often even more time consuming than the causality correction...

    The main problem with the rational method is that it really has not had much attention over the last few years - the focus has been on the convolution-based approaches (spline and linear). So I generally would advise against it, especially for larger number of ports or higher order systems. I have used it to check results in certain specific situations, but it would not be my first choice. Hopefully the specific issue you were having was followed up with R&D to help ensure that the s-parameter modelling is improved to handle the s-parameter data you were having problems with. Although of course we'd need to have your data to do that - not sure (I've not checked the service request).

    I'm sure Tawna will chime in when she sees this.

    Regards,

    Andrew.

Reply

  • Aldo,

    Using the rational model is often even more time consuming than the causality correction...

    The main problem with the rational method is that it really has not had much attention over the last few years - the focus has been on the convolution-based approaches (spline and linear). So I generally would advise against it, especially for larger number of ports or higher order systems. I have used it to check results in certain specific situations, but it would not be my first choice. Hopefully the specific issue you were having was followed up with R&D to help ensure that the s-parameter modelling is improved to handle the s-parameter data you were having problems with. Although of course we'd need to have your data to do that - not sure (I've not checked the service request).

    I'm sure Tawna will chime in when she sees this.

    Regards,

    Andrew.

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