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Large Spurs Using 5355

Question asked by jsochacki on Mar 20, 2016
Latest reply on Mar 22, 2016 by MRichardson

I have a 100Mhz reference that I am using with the following settings for the ADF5355 eval board.  This looks as expected.  When I change the VCOout frequency to 5216.666666###### or even 5216.6###### I see spurs that are -35 dB down near the VCO output frequency and these spurs are reflected in phase noise measurements.  It does not appear that the SDM is doing anything to reduce them.  How can I reduce these spurs?New Bitmap Image.jpg

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