T/R switch IC - HMC784AMS8GE IC does not work properly
Engineering Asked on December 5, 2021
I want to use a T/R switch IC to select the filters. So I made a small board test HMC784AMS8GE IC like the schematic below:
The input (IN1) is the sine signal. But when I test, both OUT1 & OUT2 have the same signal as IN1 and both outputs (RF1, RF2) are always ON. Although, I changed the Control pin (A, B) following the datasheet. It means the RF switch inside the IC did not work properly when adjusting the value of the control inputs(A, B). Could you help me to solve this problem? Thank all guys.
One Answer
Per the datasheet "RF1 and RF2 are reflective shorts when “OFF”". For best results consider the following configuration.
Also per the datasheet below is the suggested interface for logic signal A and B
I suggest try using TTL logic to drive the logic signals
References:
Answered by Mahendra Gunawardena on December 5, 2021
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