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Is it possible to hand calculate the phase noise of a VCO? (Read 1719 times)
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Silicon Valley
Is it possible to hand calculate the phase noise of a VCO?
Apr 12th, 2016, 8:39am

I am running pss/pnoise sims for a Q-VCO that I am designing. I would like to know if it's possible to hand-calculate the phase noise so that I could reduce by figuring out what exactly is causing the problem.
If so, how? I know the basic stuffs that I read on RF Microelectronics by Razavi.

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Life is a nonlinear system. The goal is to find a solution with the least error and not an exact solution.
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Re: Is it possible to hand calculate the phase noise of a VCO?
Reply #1 - May 11th, 2016, 5:48am
very rarely people does and mostly academic people would prefer to learn but not to match to the pnoise results. General procedure is Find ISf from all devices and get the rms of that and use th lee formulas for the Overall Phase noise.

Following articles might help. (this is a innovative architecture but they have decribed how to evaluate PN noise from equation and they have correlated very well with sim as well as measurements) (from slide 52)

if you find better docs or procedure than the above please let me know kindly.

Are you aware of better procedure to find ISF??

Best Wishes,

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