Oscillator PPV (Perturbation Projection Vector) Y axis value

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ORISR

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Hi,

I am simulating an LC tank oscillator with spectreRF (pss +pnoise) and plotting the ppv of the VCO output voltage. my question is what is the meaning of the Y axis in terms of phase error? if possible, in comparison to the ISF (Impulse Sensitivity Function).

Thanks!
 

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