Hello,

This question is related to the Jitter simulation from spectre pnoise.   Is the spectral density of the Jitter (Jee) a single-sideband (SSB) density or a double-sideband(DSB) result?  Another way of looking at the question is, if I want to get the total integrated noise from the spectral density would integrate the spectral density of the jitter and take that number or do I need to multiply by 2?

For a phase noise simulation, assuming that one is looking at a relative harmonic the result for phase noise is SSB - meaning that to get the integrated phase noise one needs to integrate the phase noise density then multiply by 2 to account for the other sideband.  But I'm not sure if holds true for jitter.  

To be more specific on the simulation, I have run a pss simulation then a pnoise simulation with noise type: jitter.  Command was:

analysis('pnoise ?sweeptype "relative"  ?relharmnum "1"  ?start "1000"  ?stop "10M"  ?dec "1"  ?maxsideband "50"  ?p "/vop_ndiv"        ?n "/gnd!"  ?oprobe ""  ?iprobe ""  ?refsideband ""  
           ?noisetypeUI "jitter"  ?crossingdirection "rise"  ?thresholdvalue "0.5"  ?solver "turbo"  )

Then to plot the spectral density of jitter, I did the following from the Analog Design Environment (ADE):

Results
->Direct Plot
   ->Main Form
     ->Analysis pnoise jitter
     ->Function Jee

This results in calculator expression:  
_drplJitter(?result "pnoise_pmjitter" ?unit "Second" ?k 1 ?event 0))
So the plot shows the spectral density rms jitter per Hz.  But then, is this density single-sideband or both sidebands?

Thanks for any advice.

Thanks Frank.

I'm actually interested in simulating the phase noise of a frequency divider in a PLL.  Ultimately, I'm interested in a phase noise number (in terms of dBc/Hz) which represents the jitter in the edge transition at the divider output (similar to what's described in http://www.designers-guide.org/Analysis/divnoise.pdf, or in chap. 9 of http://www.designers-guide.org/Analysis/PLLnoise+jitter.pdf) except I believe at the time of that article the "jitter" analysis method wasn't available).  As you've pointed out in other posts the "jitter" method is a special case of strobed analysis where you're looking for a threshold crossing.

So ultimately I'm trying to get the equivalent phase noise of the frequency divider in dBc/Hz.  Jitter can be converted to phase noise by multiplying by 2pi*freq but then there is still the question about single-sideband vs. double-sideband, i.e. do I need to subtract 3dB?

Thanks Frank.

What I'm referring to as "phase noise" would be the term on the left side of the equation 27 you refer to.  

L(deltaF)

I would call this the "single-sideband" phase noise (I'm not 100% certain that terminology is universally used so please feel free to correct my terminology if necessary).   I believe in practice that terminology and meaning for phase noise tends to be used because it's what you see on the spectrum analyzer in the lab.

Thanks again.