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Pnoise analysis

Jithin

Hi,

I have been designing a PLL which gives an output frequency in the range (400-500)MHz to the reference input frequency of (20-25)MHz.So for doing the pnoise analysis I have added the PSS as well as  Pnoise analysis

I have  made the following as setup for the analysis for a frequency of 500MHz. I have chosen 1) shooting method instead of harmonic balance 2)beat frequency to be the output of the divider (divider ratio is 20) that is 25MHz and also output of the PLL is selected as divider out in Pnoise tab. But it seems that the PSS is not converging and thus pnoise is failing.

So please direct me with the procedure for PSS as well as Pnoise for a PLL not for VCO alone.   

Parents
  • Tawna

     Hi Ben,

    The PLL Noise Aware flow was discontinued for a number of reasons.  I won't go into all of them here.  One being the database associated contained proprietary data/IP from the Cadence RF Methodology Kit.  As such, certain legal documents (SPLA+ SPLA Kit exhibit) to be signed before the database could be released. It was not available to University students as well.    There were limitations with some of the models in the PLL Noise Aware flow database. 

    Best regards,

    Tawna

     

Reply
  • Tawna

     Hi Ben,

    The PLL Noise Aware flow was discontinued for a number of reasons.  I won't go into all of them here.  One being the database associated contained proprietary data/IP from the Cadence RF Methodology Kit.  As such, certain legal documents (SPLA+ SPLA Kit exhibit) to be signed before the database could be released. It was not available to University students as well.    There were limitations with some of the models in the PLL Noise Aware flow database. 

    Best regards,

    Tawna

     

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