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LMX2820: PLL non-uniform boundary spur

Part Number: LMX2820

Tool/software:

We are using LMX2820 to generate 18.5 GHz signal. In the output we are seeing some random spurs with a span of 2 MHz and the spurs are not uniform and it keeps on changing for every sweep. I have attached two three images for reference. The reference for PLL is from a TCXO and the reference frequency is 52 MHz . Would like to know the issue's origin.