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How I can improve the response of AD8361 power detector?

Question asked by rajan.manhas on Aug 10, 2012
Latest reply on Aug 10, 2012 by CarlosC

Hi all,

I have evaluated AD8361ART-Eval evaluation board of rms power detector.

I have modified it for frequency band of 1.0MHz to 30MHz


As per AD application note, I replaced the coupling capacitor C1 to 1nf. which results in a HPF with lowest freq of 700KHz.

check attached excel sheet for the measurements at various freq spots.


There is a gap between a response curve (RF in and Vout) for 1MHz and other higher frequency spots.


I want to reduce this gap so that I get almost similar response across the 1.0MHz to 30MHz for particular frequency spot and Rf in power.


Kindly suggest