ADF5610 PLL: how to reduce integer boundary spurious

Hi,

We tested ADF5610 evaluation board using external low phase noise OCXO and we observed spurious frequencies around 10KHz. I attached the test results & settings done in GUI.

External Reference: 120MHz,

RF Output frequency: 13.58GHz

There is no spur in the phase noise graph provided by you in above reply..

So We gave External reference (100MHz, 80MHz, & 50MHz) using signal generator and observed more variations in the spurious frequencies while varying external reference (R divider kept constantly =1). I also attached some results.

Please suggest any method to reduce these spurs.