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AD8368: unreasonable rf noise

Question asked by dlgochna on Jun 21, 2016
Latest reply on Jul 5, 2016 by dlgochna


Hello.

 

I am observing a startling level of power instability after my signal goes through the AD8368 eval board. I have included below a picture of a scope trace showing the power output (using an RF to DC power converter). On top of the expected linear gain, there is some AC line noise (note that the scope is triggered on the AC line). I checked the supply voltage and the control voltage; both are very stable, so I was wondering if anyone here can think of where this noise is coming from. For completion, I will include that my RF frequency is 160MHz and I am operating in the default VGA mode.

 

Thanks in advance.

~Dan

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