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Measurements >> Phase Noise and Jitter Measurements >> Is it possible to hand calculate the phase noise of a VCO?
https://designers-guide.org/forum/YaBB.pl?num=1460475562

Message started by iVenky on Apr 12^th, 2016, 8:39am

Title: Is it possible to hand calculate the phase noise of a VCO?
Post by iVenky on Apr 12^th, 2016, 8:39am

Hi,

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.

Thanks

Title: Re: Is it possible to hand calculate the phase noise of a VCO?
Post by raja.cedt on May 11^th, 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.

http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7006708 (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)

http://gram.eng.uci.edu/faculty/green/public/courses/270c/materials/lectures/Week6/Week6.pdf (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,
Raj.