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The relationship between the reference oscillator and  PLL phase noise

Question asked by bitbad on Apr 18, 2016
Latest reply on Apr 23, 2016 by rbrennan

Hi,

 

I test the phase noise in my PLL based on ADF4159 and I don't know the relationship between the reference oscillator and the total PLL phase noise, could anyone tell me?

 

The normalized phase noise floor (PNsynth) contributes to the in-band phase noise of the PLL as the formula:

PN = PNsynth + 10Log(PFD) + 20Log(N), similarly, what is the formula for the reference oscillator ?

 

Thanks.

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