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ADF4371 Phase Noise


I have simulated the phase noise of AD4371 to output LO signal between 11-11.5GzHz. ADISIM File attached. 

The LO is applied to ADMV1017 which goes through x2 or x4 LO Multiplier which degrades the phase noise. 

I like to improve the phase noise of the LO coming out of ADF4371. Can someone please advise how can I improve the phase noise? 

Thank you.

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