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Measurements >> Phase Noise and Jitter Measurements >> Different delays in RO-VCO stages?
https://designers-guide.org/forum/YaBB.pl?num=1327702081

Message started by Aman on Jan 27^th, 2012, 2:08pm

Title: Different delays in RO-VCO stages?
Post by Aman on Jan 27^th, 2012, 2:08pm

What happens to the spectral purity of a ring oscillator with different delays for each stage? My understanding is that even for a highly linearized SS model staggered poles will lead to a much wider frequency spread to achieve the avg. 360 phase shift; hence higher Jitter/Pnoise. This can also be explained if we start looking at the non-linear limit cycle behavior; the trajectory might still be stable e.g. Demir; but the boundary will be spread (chaotic) even if we ignore internal noise of the devices. If I'm correct is there a way to demonstrate this using HB-PSS?

Title: Re: Different delays in RO-VCO stages?
Post by raja.cedt on Jan 28^th, 2012, 2:21am

could you please explain better....i didn't understand most of the temrs like SS..

Thanks,
Raj.