FM demodulation circuit

Details FM demodulation circuit FM demodulation circuit

1993-01-27

1995-04-18

Mis, David

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329318, 331 23, 331175, H03D 300, H03D 328, H03L 102, H03L 700

Patent

active

054081955

ABSTRACT:
An FM demodulation circuit comprises, an oscillation circuit (3) whose oscillation frequency is varied by a control signal, a phase comparator means (2) for comparing phases of signals between an FM signal to be demodulated and the output signal of the oscillation circuit (3) and generating a comparison signal corresponding to the phase difference, an additional voltage determining circuit (7) for determining an additional voltage based upon the comparison signal, and an adder (5) for adding the comparison signal and the additional voltage, and supplying the added result as the control voltage. The additional voltage may be a value which makes the comparison signal level at a center level of the operable range of the phase comparator (2).

REFERENCES:
patent: 3411103 (1968-11-01), Deman et al.
patent: 3495184 (1970-02-01), Perkins et al.
patent: 4107624 (1978-08-01), Turner
patent: 4568888 (1986-02-01), Kimura et al.
patent: 4980652 (1990-12-01), Tarusawa et al.
patent: 5168246 (1992-12-01), Pulluru et al.

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