After doing a jitter simulation using PSS+Pnoise simulation on an oscillator, in the “Direct Plot Form” in “Affirma Analog Design Environment”, there are four analysis: “pss”, “pnoise”, “pnoise modulated” and “pnoise jitter”. We can plot phase noise of the oscillator with two different methods:
1-  Analysis=pnoise,   Function=Phase Noise
2-  Analysis=pnoise jitter,      Function=Phase Noise  

The result of the second approach is 3dB higher. Can somebody explain for me the difference?

Thanks

OpAmp wrote on Oct 22^nd, 2008, 7:09am:

1 is SSB SideBand Noise.
 This is small signal mixing noise, that is, sideband noise which include both AM and PM noise.

2 is phase noise.

Agilent GoldenGate give same result as "pnoise jitter" and as another results, there are "side_band_left" and "side_band_right" which are same as "pnoise".

See followings.
http://www.designers-guide.org/Forum/YaBB.pl?num=1223659963/1#1
http://www.designers-guide.org/Forum/YaBB.pl?num=1220755065/1#1