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envelope detector vs. peak detector. (Read 5181 times)

Jacki Senior Member Offline Posts: 237	envelope detector vs. peak detector. Feb 10^th, 2014, 1:45pm Hello, I am a little confused about the envelope detector and peak detector. Are they same or different. It seems peak detector usually works for square wave, but envelope detector can work work any AM signal. Could you explain some details or suggest some references? Thank you.
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Jacki Senior Member Offline Posts: 237	Re: envelope detector vs. peak detector. Reply #1 - Feb 10^th, 2014, 1:53pm I cannot find any difference between envelope detector and peak detector since both of them need to detect the peak value of amplitude then rebuild the waveform. Any comments?
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loose-electron

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Re: envelope detector vs. peak detector.
Reply #2 - Feb 18^th, 2014, 6:52pm

They are mostly the same -

The difference I have seen is that the BW of a peak detector is fast enough to respond to local amplitude variances than an envelope detector.

However it is a bit fuzzy.

Also, a peak detector is often associated with a specific magnetic recording readback circuit. (they were widely used prior to PRML channels prior to 1995)

Jerry Twomey
www.effectiveelectrons.com
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Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical

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Jacki Senior Member Offline Posts: 237	Re: envelope detector vs. peak detector. Reply #3 - Feb 24^th, 2014, 5:12pm Hello loose-electron, Thank you for your reply. Actually I try to simulate an envelope detector, but still cannot do it successfully. If you are familiar with this topic, could you check this post and give me some hints? http://www.designers-guide.org/Forum/YaBB.pl?num=1393290522 Thank you.
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