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HMC960 external bias

Question asked by alexeyklimov on Jan 17, 2018
Latest reply on Jan 17, 2018 by alexeyklimov

#hmc960

 

Hello. I am using HMC960 in my project and I have one question.

 

Why external ~2.5V bias (see img) use in input and output at the same time as  CMI/Q bias is applying ?

 

How I know, On the enaluation board OUTPUT external bias ~2.5V don't used, but  INPUT external ~2.5V bias is used. 

 

 

Shall I use 1)only input or 2)only output  or 3) both  external bias ~2.5V in my design for correct work of HMC960 ?

Is using of CMI/Q bias  necessarily ? 

I use AC-coupling and common mode level doesn't matter.

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