Synchronous demodulator

Details Synchronous demodulator Synchronous demodulator

1989-09-29

1991-05-14

Mis, David

Demodulators

Amplitude modulation demodulator

Input signal combined with local oscillator or carrier...

329349, 307353, H03D 104

Patent

active

050159631

ABSTRACT:
A synchronous demodulator includes a switch which is operated in synchronism with an incoming periodic signal and both divides and applies that signal to two signal channels. The two channels each include a network for computing and holding, for a predetermined length of time, the average signal value on that channel and applies those values, in the form of two other signals, to the inputs of a diffferential amplifier. The networks may be R-C networks. The output of the differential amplifier may or may not form the output of the synchronous detector and may or may not be filtered. The output will not include a periodic signal due to the presence of a dc offset. Additionally, the output will not contain any substantial ripple due to periodic components in the input signal. In a somewhat more complex version, containing twice the structural components of the above synchronous demodulator with a more complex switching mechanism, essentially all ripple due to periodic components in the input signal are eliminated.

REFERENCES:
patent: 3602826 (1971-08-01), List et al.
patent: 3820033 (1974-06-01), Iwata
patent: 4167650 (1979-09-01), Kusano
patent: 4262258 (1981-04-01), Gaalema
patent: 4847523 (1989-07-01), Schneider

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