Part Number: LMX2582
We have 8 boards with LMX2582 on each. In our application we switch between a set of different frequencies and when we return to the same one, on some of the boards we experience a small phase shift (about two degrees). It has two distinct levels, as seen in the image. Also cannot blame the pfrequency divider, as it can be seen on 3.7 GHz, where frequency is taken straight from the VCO. What could be the cause?
