On Wednesday 06 September 2006 06:55, Dan McMahill wrote: > Bob Paddock wrote: > >He recommended an obscure > > division technique instead. I'll dig the paper up this evening.
"Instantaneous filterless AM demodulation with an analog divider." by Brunner, Eberhard; Gilbert, Barrie. Electronic Design Analog Applications Issue November 18, 1996 page 71 & 72. Makes reference to "B. Gilbert, 'New Analogue Multiplier Opens Way to Powerful Function-Synthesis,' Microelectronics, Vol. 8, No. 1, London, 1976." I'll put in a request at the library next time I'm going that direction... "Amplitude Modulation (AM) is implemented by multiplication; it follows that demodulation ought to use division. In practice, however, the required element - a low-cost four-quadrant divider (4QD) - has not been available." Circuit uses two AD633s, to make the divider. -- http://www.softwaresafety.net/ http://www.designer-iii.com/ http://www.unusualresearch.com/ _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
