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HMC8038 isolation between two output ports


I would like to use the isolation path between RFC1 and RFC2 of HMC83038 switch as a back calibration path for my signal. I see in S2p parameters provided that there is around 60dB isolation loss at 940 MHz, that works for my application (880-980 MHz). Question: is this isolation performace similar enough for differnet switch smaples, and how much is the deviation? I see if the switch is disabled, the isolation between RFC1 and RC2 is reduced to -55dB. Thank you!