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Design >> Analog Design >> peak detector for AGC
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Message started by raja.cedt on Aug 6^th, 2012, 12:56am

Title: peak detector for AGC
Post by raja.cedt on Aug 6^th, 2012, 12:56am

hello,
can any one suggest a peak detector for my AGC?

I have trans impedance with 150 gain followed by a AGC whose gain changes from 2 to 5 because my receiver gain has to be programmable from 300 to 750, but for me peak detector is giving is problem (basically it's a differential pair with some capacitor at the tail node)

Thanks,
Raj.

Title: Re: peak detector for AGC
Post by loose-electron on Aug 26^th, 2012, 1:08pm

expand the question a bit more and maybe we can help.

Peak detection methods have limited linear range, Log amp structures are more applicable for wide dynamic range.

But need to know more about what you are trying to do.

Title: Re: peak detector for AGC
Post by raja.cedt on Jun 3^rd, 2013, 4:29pm

Hello,
Thanks for the reply, at present i am using square based Peak detector(basically a gilbert multiplier with input shorted). My question is how to find the incremental model for this to estimate the loop dynamics, i am not finding any clear document for the AGC loops, i guess even other kind of detectors (rectifier,RMS) model is same as my detector.

I will be happy if some helped me this problem.

Thanks,
Raj