rfmems wrote on May 13th, 2009, 2:58am:Conventional pnoise/hbnoise shows clearly f^-3 region in phase noise
No.
If we compare phase noise results of f^-3 region between Agilent ADSsim and Cadence Spectre Conventional Pnoise, Agilent ADSsim often gives more matched results with actual measurement data.
rfmems wrote on May 13th, 2009, 2:58am:pancho_hideboo wrote on May 12th, 2009, 6:41am:However according to your comments, "Augmented Pnoise" for your design does give higher phase noise for very small offset frequency than Vanilla Pnoise.
According to my simulation, using hb/hbnoise for LC oscillators,
the phase noise gets smaller for small offset (close and below line width) when augmented hbnoise is chosen.
And phase noise clearly shows a Lorentzian plot.
Your tendency about "Augmented Pnoise" is different from one of ACWWong.
rfmems wrote on May 13th, 2009, 2:58am:However if shooting pss/pnoise is used, I still see above 0dBc/Hz phase noise and a non-Lorentzian plot.
"Augmented Pnoise" has been already implemented in Shooting-PSS/Pnoise ?
I think it is still only for HB-PSS/Pnoise.
rfmems wrote on May 13th, 2009, 2:58am:I heard that augmented pnoise is not a completed work and cadence is still releasing enhancemented versions.
Before completing or improving, this "Augmented" option in Pnoise might be forgotten as same as many imcomplete options of Cadence SpectreRF.
rfmems wrote on May 13th, 2009, 2:58am:pancho_hideboo wrote on May 12th, 2009, 6:41am:If so, "Augmented Pnoise" has to suppress f^-3 region in phase noise.
I believe that is wrong, augmented hb/hbnoise simulation shows both a lorentzian plot and f^(-3) region.
Based on "Lorentzian Spectrum", the spectrum is flat up to the 3dB-linewidth point, and roll-off at 20dB/decade thereafter.
I don't know definition of "Lorentzian Spectrum" which include f^-3 region.