I am using HMC520a as direct QPSK modulator. In this configuration, should I use IF1 as I channel and IF2 as Q channel or otherwise (IF2 as I and IF1 as Q)? A wrong implementation will give me a phase reversal.
The Applications section gives the configuration to connect the IF ports for sideband configuration. We recommend ordering an evaluation board and testing in your application as well.
I check the performance on my circuit. Using IF2 as I chain and IF1 as Q chain works for QPSK modulation. If used otherwise, it gives a reversal error when demodulating the signal.