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Regarding PNOISE results obtained from Spectre-RF

sarfraz

Hi,
What sort of spectral density is obtained when we do Pnoise analysis in Spectre-RF.
Is it power spectral density of phase or is it power spectral density of voltage?

Best Regards
Sarfraz

Parents
  • Thanks Andrew for the quick response,

    I tried simulation with  noiseType=modulated.

    What I found is that it decomposes the results into AM, PM, USB and LSB?

    Now I have a question, correct me if I am wrong:  When we need the power spectral density (PSD) for phase we should take into account the noise contribution of amplitude modulation as it is converted into phase modulation?

    So what I conclude is that with Spectre-RF we will not be able to see PSD of phase with all noise sources included; As from phase noise simulation with noiseType=sources, we get the PSD for voltage (which as you pointed out in your reply, will be close the PSD of phase for oscillator kind of circuit) and with noiseType=modulated we can individual contribution of AM and PM.

    Best Regards

    Sarfraz
Reply
  • Thanks Andrew for the quick response,

    I tried simulation with  noiseType=modulated.

    What I found is that it decomposes the results into AM, PM, USB and LSB?

    Now I have a question, correct me if I am wrong:  When we need the power spectral density (PSD) for phase we should take into account the noise contribution of amplitude modulation as it is converted into phase modulation?

    So what I conclude is that with Spectre-RF we will not be able to see PSD of phase with all noise sources included; As from phase noise simulation with noiseType=sources, we get the PSD for voltage (which as you pointed out in your reply, will be close the PSD of phase for oscillator kind of circuit) and with noiseType=modulated we can individual contribution of AM and PM.

    Best Regards

    Sarfraz
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