LMX2594: The spurious issue for LMX2594

Part Number:LMX2594

Hi team,

The customer uses LMX2594. He has the spurious issues as below:

Q1: When REF is 300MHz and VCO outputs 27GHz, the spurious is very large in 27.3GHz,27.6GHz,27.9GHz,28.2GHz

and 28.5GHz. 

Q2.:When REF is 300MHz ,FPD is 300MHZ, the reference is the Phase frequency of X1/1,

 VCO outputs 27GHz, the spurious is very large in 27.15GHz and 27.45GHz. 

Would you provide some suggestions?

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments