I'm using 5 RF ports (out of 6) of HMC252, the unused one is left float. during test,the received signal is very poor. My question is do I need to connect the unused RF port to GND via a 50ohm resistor? I thought the IC did this termination inside.
HMC252QS1624E is a 50-ohm absorptive type switch so unselected RF ports are terminated to 50ohm internally.
If there are unused RF ports, for robustness of the product and better isolation, we suggest terminating the unused RF ports to ground via 50-ohm resistor and dc blocking capacitor.
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