I am trying to use the ADL5387 for downconverting 60MHz radar IF to IQ baseband.
When approaching 60MHz RF and 120MHz LO from a higher start frequency the LO leakage to both IQ outputs are increasing significantly.
At 60/120MHz the IQ to LOleakage ratio is in the order of 6dB for 0dBm input levels on both RF (61MHZ) and LO (120MHZ). Is this normal ? I assume no. what could be the problem ?
My PCB layout is similar to the eval board letting all ground pins connect to the EP which has a short low res and thermal path to common groundplane.
(The bias pin was by accident shorted to ground on first power on, but I assume this does not cause the problem)