diyAudio Forums Archive > Top > Source > Analogue Low distortion AM radio detector - Click HERE for Original Thread Circlotron Can anyone point me toward some info on low distortion AM radio detectors? I imagine a high speed opamp with a diode in the feedback loop. jackinnj Here's a circuit from Bob Schenck -- uses a precision rectifier -- perhaps you would want to use a CFB opamp: http://www.amwindow.org/tech/htm/alowdisdet.pdf He goes through the maths. Circlotron Yo! Thanks for that. :) BrianL Perhaps you should also look at a Burr-Brown (aka TI) OPA698 "clamp amp". You can set one of the clamp voltages to zero and make essentially a half-wave rectifier. A couple of these and a few ancillary components and you have a full-wave rectifier. There are also other op-amp-based rectifier circuits jcx direct conversion software radio with Mega-sample ADC and DSP chip? ratza http://sound.westhost.com/articles/am-radio.htm dangus Read up on synchronous detectors. IIRC that's about the best AM demodulator around. The CQAM AM stereo decoder was basically a glorified synchronous detector. Some Chrysler car radios supported AM stereo (mid '80s to ?) and they should cost you very little from a wrecking yard or eBay. http://users.hfx.eastlink.ca/~amstereo/amstereo.htm The following page is a goldmine of info on synchronous detection: http://users.netonecom.net/~swordma...rtWaveRadio.htm oshifis Also worth considering a PLL oscillator tuned for the carrier and a double balanced mixer (ring DBM) with suitable diodes. I think that is called synchronous detection.

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