I am using FMCOMMS8_ZCU102 setup with a 200MHz bandwidth receiver, sampling at 245.76Msps. When I'm tuning any LO in lower band range (150MHz to 900MHz) or higher band range (5GHz to 6GHz) using FHM GPIO Mode, then the phase variation is upto +/- 10 degrees. Whereas phase variation is upto +/- 1 degree in case of middle bands (900MHz to 5GHz) . Why is there so much variation for phase difference in side bands ? Are there any suggestions for improvement in phase particularly in these bands?
Thanks & Regards