I'm sketching out a phased-array radar design (RFID reader, actually, but it's basically the same thing) that needs accurate cancellation of Tx->Rx feedthrough (largely due to coupling among the antennae). The Tx signal (915 MHz band) needs to be phase-shifted, scaled, and added to the Rx signal. Judging from the ADL5391 datasheet, it would be suitable for this use, given a voltage-controlled phase shifter at one input and the appropriate in-system measurement and control paths.
There are various design challenges here, some of them application-specific. But the first is to get a handle on this new multiplier architecture, and in particular on its impedance matching requirements, which could complicate the implementation of the varactor-based phase shifter. Is there an ADL5391 application note, or other reference design, that would help?
Thanks in advance,