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Nport Component (S-Parameter Files) in PSS Analysis

Frank Wiedmann

The nport component that is used to include S-parameter files in a simulation has been improved very much in MMSIM 12.1 with respect to earlier releases. However, in its current state, it unfortunately cannot be used in a pss analysis (see the comments at the end of http://www.cadence.com/Community/blogs/rf/archive/2012/11/19/spectre-rf-mmsim-12-1-preview-of-coming-attractions.aspx ).

It is currently not clear if there is sufficient demand from Cadence customers to implement support for the pss analysis into the nport component in the upcoming MMSIM 13.1 release. So, if you would like to use S-parameter files in a pss analysis in the near future, you might want to ask Cadence support to file a duplicate of CCR 1042280 on your behalf.

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  • Frank Wiedmann
    Hi Tawna,

    Thanks for your clarification. Unfortunately, rational interpolation does not work very well in many cases. The resulting models are often not passive so that the simulation will blow up. You yourself recommend to be careful with this setting on page 16 of the application note at http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=wp;q=ApplicationNotes/Custom_IC_Design/NportAppNote11.1.pdf and in the comments to http://www.cadence.com/Community/blogs/rf/archive/2011/03/23/my-favorite-nport-settings.aspx .

    I would also like to point out that not only the pss analysis of autonomous circuits (oscillators) is not supported with the nport component, but also the pss analysis of driven circuits. Our testcase that is referenced by the CCR is a driven circuit.

    Best regards,

    Frank                                         
Reply
  • Frank Wiedmann
    Hi Tawna,

    Thanks for your clarification. Unfortunately, rational interpolation does not work very well in many cases. The resulting models are often not passive so that the simulation will blow up. You yourself recommend to be careful with this setting on page 16 of the application note at http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=wp;q=ApplicationNotes/Custom_IC_Design/NportAppNote11.1.pdf and in the comments to http://www.cadence.com/Community/blogs/rf/archive/2011/03/23/my-favorite-nport-settings.aspx .

    I would also like to point out that not only the pss analysis of autonomous circuits (oscillators) is not supported with the nport component, but also the pss analysis of driven circuits. Our testcase that is referenced by the CCR is a driven circuit.

    Best regards,

    Frank                                         
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