BillH
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Posts: 7
San Diego
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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.
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