FM signal demodulator phase locked loop

Details FM signal demodulator phase locked loop FM signal demodulator phase locked loop

1994-12-22

1996-06-04

Mis, David

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329318, 331 23, 455208, 455214, 455337, H03D 300, H03L 708

Patent

active

055237207

ABSTRACT:
A frequency modulation signal demodulator receives an intermediate frequency signal to demodulate a FM signal. The frequency modulation signal demodulator includes a voltage-controlled oscillator having variable capacitance diodes. The voltage-controlled oscillator varies the oscillating frequency of a signal by controlling a voltage across the variable capacitance diodes using a DC voltage. Also included is a phase comparator which produces a phase difference by comparing the phase of the intermediate frequency signal to the phase of the signal from the voltage-controlled oscillator and provides a direct current voltage signal corresponding to the phase difference. Also included is a differential amplifier which has an adjustable reference voltage source. The differential amplifier amplifies the direct current voltage signal to produce a demodulated signal. The demodulated signal is negatively fed back to the voltage-controlled oscillator as the direct current signal.

REFERENCES:
patent: 4107624 (1978-08-01), Turner
patent: 4568888 (1986-02-01), Kimura et al.
patent: 4879528 (1989-11-01), Gotanda
H. Yabuki, M. Sagawa, and M. Makimoto, "New Type of Push-push Oscipliers for the Frequency Synthesizer," 1992 IEEE MTT-S International Microwave Symposium Digest, vol. 2, 1 Jun. 1992, Albuquerque, pp. 1085-1088 European Search Report, Mar. 23, 1995.

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