Hello ppl.,
               I am running PXF analysis on oscillators. In order to verify my understanding of the PXF analysis, I am running a simple experiment.  I injected  resistor noise through a controlled source to  specific nodes of the oscillator. I manually calculated the resistor noise contribution from the output of the PXF analysis.
Manual calculation:

rn - resistor noise
sn - transfer function from sideband n (output of PXF analysis)

total resistor noise contribution = rn*(s0^2+s1^2+..)

I tried verifying the same by the noise contribution summary that spectre spits out. They don't seem to match. Am I doing something wrong here?  Let me get your inputs/suggestions.

Thanks,
Ganesh.

Hi Ken,
          Thanks for your reply. There is some subtlety in PXF which I think I understood better. In the VCO actually I was looking at k=-1,0, 1 sidebands for the PNOISE analysis. While the corresponding sidebands in the PXF analysis was k=0,-1,-2. This is because my fout in the pxf analysis was (Fundpss + offset frequency). Correspondingly the fin is offset by 1 harmonic.

Does this sound alright?

-Ganesh.

Got it! Thanks a lot, Ken.

-Ganesh.