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Power Detector in Power Amplifiers - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

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 ... gailis.pdf

Are you designing using GaAs or SiGe?



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