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Low frequency harmonic along with Desired ouput

Question asked by dhavalp on Nov 4, 2016
Latest reply on Nov 4, 2016 by neilw

I want to generate 52 MHz output signal from my PLL. On the spectrum analyzer, I am seeing low frequency harmonic at multiple of 8.1 KHz offset from 52 MHz on both size.

 

Does it have any relation to my PFD or loop filter bandwidth? My PFD is 2 MHZ and loop filter bandwidth is 112 KHz.

 

Regards,

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