Monolithically integrable frequency demodulator device

Details Monolithically integrable frequency demodulator device Monolithically integrable frequency demodulator device

1996-12-30

1999-05-11

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Input signal converted to and processed in pulse form

329343, 455214, H03D3/04

Patent

active

059031875

ABSTRACT:
Frequency modulated signals are demodulated through a limiter circuit that chops the signal to give pulses whose occurrence frequency is proportional to the instant frequency of the received signal. The invention is devoted to a new processing of those pulses. The leading edges of the pulses are time integrated. The obtained signal is then as usual, low pass filtered to give the demodulated signal. The main advantage of this new processing is that the circuit that makes this processing does not implement delay lines and can then be made as a single chips.

REFERENCES:
patent: 3594588 (1971-07-01), Evans et al.
patent: 3824410 (1974-07-01), Funaki et al.
patent: 4280100 (1981-07-01), Dann
patent: 4350957 (1982-09-01), Miyamoto
patent: 4800338 (1989-01-01), Yoshizawa et al.

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