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Power Detector in Power Amplifiers - RF Cafe Forums

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Post subject: Power Detector in Power Amplifiers Posted: Thu Oct 06, 2005 4:27 am


Joined: Thu Oct 06, 2005 3:45 am

Posts: 7

Location: India

Hi all,

I would like to know more about the power detector circuit which is included in the power amplifiers.

I am more interested in power amplifiers for 802.11a/b/g.

Can someone suggest some articles on designing the power detector for the same ?





Post subject: Posted: Thu Oct 06, 2005 10:05 pm


Joined: Mon Sep 26, 2005 7:29 pm

Posts: 13

I would assume that some type of directional coupler is used. You do not want the detector to affect impedance or S21 params. So using a driectional coupler would satisfy those requirements. At the pooper end of the coupler I would think a simple detector diode with temp comp. But you did mention 802, and I am not versed in the technology so maybe I should be quiet



Post subject: Power Detector in Power AmplifiersPosted: Fri Oct 07, 2005 1:26 am


Joined: Thu Oct 06, 2005 3:45 am

Posts: 7

Location: India

Hello ,

I am designing a MMIC PA and i want a power detector to be added on to the same chip.

Hence i want some guidelines for designing a power detector.

Any related articles on power detector would be very helpful.

with best regards,




Post subject: On Chip RF Power DetectorPosted: Sun Oct 16, 2005 5:57 pm


Check the following Paper

http://www.ireap.umd.edu/MURI-2001/Revi ... gailis.pdf

Are you designing using GaAs or SiGe?



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