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Phase noise simulation

lahsivece

Hi All,

I am simulating phase noise of a ring oscillator from 100Hz to 500MHz (pss +pnoise)

I am simulating phase noise of a free running oscillator ( Just a ring oscillator and no stimulus to ring oscillator ). The ring oscillator is parasitic extracted.

I am getting a phase noise profile which looks close to ideal specially beyond 100MHz (please see attached image). It is hitting close to spectre noise floor .  I have two doubts :

1) Is my simulation correct ? During the course of measurement, the free running oscilator will show  a phase noise profile which doesn't look anything like that shown by simulation ( Oscillator will drift and hence carrier will drift and hence phase noise measurement will be kind of wrong . Oscillator needs to be stabilized for measurement of phase noise)

2) Is there a way to make this good looking phase noise bad in simulation with free running ring oscillator. ( When I am using injection locked oscillator with injection source having the phase noise profile of a real source (agilent VSG) , I am getting almost correct phase noise profile)

 

Please advise

Thanks,

Vishal

Phase noise profile of free running osc

     

 

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