Our customer request me a block diagram of measurement setup of image rejection for HMC1056LP4BE. Do you have any application note or somthings of it?
To measure the image rejection, an external 90 hybrid is needed here after the IF1 and IF2. Then hook a spectrum analyzer to the hybrid output and drive the LO.
Set up the RF input at frequency f1 and record the output power level in dBm.
Then set up RF input at the image frequency, the same distance from the LO and record the output power level.
The difference of the two output power level is the image rejection.
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