ADF4002 reference Spurs

Question

Hi, 
 I am using EVAL-ADF4002 with external 10MHz reference signal and -50dBc reference spur was observed. 
 I am using CVC055CW-0100-0200 VCO from Crystek microwave and PLL register setting:

Test result:

How can I minimize 10MHz spur? thank you.

aandrews · Accepted Answer

Sometimes a sine wave signal type reference can help with reference spurs. A loop filter with additional poles may also help. Any leakage on the CP line can increase reference spurs. This is described in detail here

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ADF4002 reference Spurs

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