I have tried to use ADF5355 as RF PLL integrated VCO chip.
When I test chip with board, The output has some spur...
There is my PLL setting
I didn't use REF EVAL board. so I used USB to serial Port and ARM chip (coretex M4)
First, I set chip upper setting value for initialization. After picture is output on spectrum.
It seems to be FM modulation..... So I changed loop filters on datasheet and ADsimPLL, or REF source 100MHz to 122.88MHz. But this spur is always displayed on spectrum... I think it not integer boundry spur,cuz spur is on display with integer setting as 4GHz or 5GHz. I don't know how to solve.... Plase help me!!