FM Demodulator

Details FM Demodulator FM Demodulator

1982-02-04

1984-12-11

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 329124, 455214, 455337, H03D 300

Patent

active

044881193

ABSTRACT:
An FM demodulator in which an incoming FM signal (2a sin(.omega.+.delta..omega.)t) is demodulated to baseband (.delta..omega.) by applying it to first and second mixers (12, 14). The output (b sin .omega. t) of a local oscillator (16) is applied to one (14) of the mixers and is also applied to the other (12) of the mixers via a 90.degree. phase shifter (18). The phase of the output of one of the mixers is shifted so as to be in phase or in antiphase to the other and is applied together with the output of the other of the mixers to a signal divider (22), the output of which comprises the baseband signal which is substantially independent of fading.

REFERENCES:
patent: 3035231 (1962-05-01), Neelands et al.
patent: 3101448 (1963-08-01), Costas
patent: 3500217 (1970-03-01), Allen
patent: 3609555 (1971-09-01), Van Blerkom et al.
patent: 4145663 (1979-03-01), Yahata et al.
patent: 4253067 (1981-02-01), Caples et al.
patent: 4270221 (1981-05-01), Daniel, Jr.

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