I'm interseting for minimal acceptable LO drive level for HMC558A. I found no any mention about it. Just "The HMC558A provides excellent LO to RF and LO to IF isolation due to optimized balun structures, and operates with LO drive levels as low as 9 dBm." Can it work with LO drive level less than 9 dBm or not.?
If you take a look at the datasheet, for some frequency the performance starts to degrade at 9dBm. We never done characterization for less than 9dBm condition. You can get an eval board and test it in your lab. But we don't guarantee the performance.