HMC252 works abnormally

Question

We’re using HMC252 in a Bluetooth application. At first, the HMC252 was working correctly, but later on 1 out of the 6 channels is broken (very high DC impedance while the control pins are set correctly). We then replaced the HMC252 with a new chip, that channel was then back to normal. This phenomenon has occurred in three HMC252s. We’re wondering what is the cause for this? A wrong design of the circuit? And how to modify it. 
 
 Does anyone seen this before?

FormerMember · Accepted Answer

Hi, 
 Can you provide me your circuit schematic and supply/control/RF input conditions for my review? 
 Does the failure occur on same RF port for all three HMC252 parts? What are the failure symptoms (high insertion loss, poor return loss etc.), please provide some measurement results? If you measure abnormal DC readings on one of the control inputs, you are supposed to be unable to select more than one RF ports (see the control voltage truth table in datasheet). 
 Best.

EZAdministrator · Answer

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HMC252 works abnormally