FM demodulator

Details FM demodulator FM demodulator

1989-05-01

1990-05-22

Mis, Davis

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329315, H03D 300

Patent

active

049280686

ABSTRACT:
An FM demodulator circuit uses an oscillator to provide a switch control signal synchronized to an FM signal, and a current supply to provide differentially alternating currents at first and second outputs flowing through a commutator circuit to the first and second outputs of the FM demodulator circuit. The commutator circuit is responsive to the switch control signal for alternately switching the first and second outputs of the current supply between the first and second outputs of the FM demodulator circuit thereby providing an alternating current flowing in the first and second outputs of the FM demodulator circuit which has an average value over each half cycle of the switch control signal proportional to the deviation of the frequency of the FM signal from the free-running frequency of the oscillator.

REFERENCES:
patent: 3479607 (1969-11-01), Ruthroff

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