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Getting Oscillator PPV waveform in pnoise analysis

RFStuff

Dear All,

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

From the PPV wave form one can get the ISF (impulse sensitivity function) which gives a detail analytical view of how a noise source in the oscillator impacts the phase noise of the oscillator) 

There is an option on the pnoise options form called "enable osc ppv"  (As given in Spectre® Circuit Simulator and Accelerated Parallel Simulator RF Analysis
User Guide Product Version 16.1). But it also says "it is no longer is used". What does it mean ?

Could I use this to plot the PPV waveform ?

Kind Regards,

  • Just realised I didn't answer this.

    Yes, you can. It was mostly provided to support the old (now no longer supported) noise aware PLL flow. We have however made recent fixes related to the PPV output, so R&D are still supporting it. You should however use a recent spectre version (at least SPECTRE17.1 ISR2) because outputting PPV in earlier versions may end up disabling the newer noise methods which were introduced a while back to improve accuracy and reliability.

    Regards,

    Andrew.

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