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PPV values from pss/pnoise simulation in spectreRF

VLSIiitm

I would like to see the perturbation projection vector(PPV) which is used, e.g. to calculate phase noise in an oscillator.

I read an old presentation on "Noise aware PLL plugin" (www.cadence.com/.../ctp_cdnlivesv2007_Thibier...). Apparently this has been discontinued(according to this post community.cadence.com/.../31327). Anyway, in the presentation, it says that perturbation projection vector(PPV) values are stored in the simulation results directory(slide 17). Is this true of a regular pss/pnoise simulation in SpectreRF? If so, how would I make it save the PPVs and access the results? Is there some argument that can be given to save? (like for time varying operating points as mentioned in this post community.cadence.com/.../21507) 

(SpectreRF certainly calculates all these, but I don't know how to access these)

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  • Why do you want to see this? It's part of a flow that is now discontinued, as you mentioned.

    There is an option on the pnoise options form called "enable osc ppv" which does save a results database (accessible via the results database after simulation), but I've no idea if it would be of any use to you or even if the results are still useful (given the discontinuation of the rest of the flow, I doubt very much whether it's actively tested).

    Regards,

    Andrew.

Reply

  • Why do you want to see this? It's part of a flow that is now discontinued, as you mentioned.

    There is an option on the pnoise options form called "enable osc ppv" which does save a results database (accessible via the results database after simulation), but I've no idea if it would be of any use to you or even if the results are still useful (given the discontinuation of the rest of the flow, I doubt very much whether it's actively tested).

    Regards,

    Andrew.

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