The Tayloe et.al. look a lot like Dr Sutton's work for NASA on his Synchronous Demodulator. "Improved Analog Synchronous Demodulator: Output ripple is suppres

The Tayloe et.al. look a lot like Dr Sutton's work for NASA on his Synchronous Demodulator. "Improved Analog Synchronous Demodulator: Output ripple is suppressed without an output filter" GSC-13179, NASA Tech Briefs, March 1992. Uses dual op-amp and 4053 CMOS switches. "Digital Synchronous Demodulator: The digital version offers greater speed, precision, and reliability." GSC-13273. Here Dr Sutton corrects me for mixing two of his unrelated NASA projects: "Hi Bob, The synchronous detectors were used in temperature monitors and temperature controllers designed to control temperatures on spacecraft at 60 milliKelvin +/- a few ucroKelvin. The preamplifier had to have a gain of 10E5 after which the demodulated signal had to be converted by a 16 bit ADC, with +/- 1LSB allowable error.... so of course, you can see that we were working with extremely small signals buried in the noise, and we had to go all out in an effort to beat down the noise. That's why we had to use a new improved synchronous demodulator. This project was as close to being impossible as you can get! I still have trouble believing that we actually made it work. The active ("Black Hole") antenna was developed in another project, where we didn't want to transport a two meter long antenna that weighed 200 pounds.....so we miniaturized the hardware while simultaneously expanding the antenna field cross section. We wanted to receive the entire ELF-VLF bands all at once, so we had to have an extremely broadband antenna....like four decades of bandwidth or more. You wouldn't believe the arguments I had with the reviewer at Physics Essays. He just couldn't believe that one could do what we did....and if it was indeed true, then why hadn't someone done it years ago?.., "and what makes you so smart", .so, of course, "this must be nonsense, etc....." Progress in physics is so bloody difficult because most physicists think that everything worthwhile has already been discovered....so they expect nothing new. This is negative feedback which, of course, makes the system stable, I suppose." - John Sutton, Ph.D. https://web.archive.org/web/20101201225337/http://unusualresearch.com/Sutton/sutton.htm https://web.archive.org/web/20101201225337/http://unusualres...