FM demodulator circuit whose demodulation output is decreased in

Details FM demodulator circuit whose demodulation output is decreased in FM demodulator circuit whose demodulation output is decreased in

1991-07-09

1992-08-04

Pascal, Robert J.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329337, H03D 300

Patent

active

051362546

ABSTRACT:
A differential amplifier amplifies an FM signal supplied from an FM signal source. A phase shift circuit shifts a phase of a carrier signal included in an FM signal output from the differential amplifier. A multiplier circuit multiplies an FM signal supplied from the differential amplifier to a first balance input terminal and an FM signal supplied from the phase shift circuit to a second balance input terminal and then outputs a demodulation signal. A resistor serving as a supply means supplies an FM signal, whose carrier signal has a phase opposite to that of a carrier signal of an FM signal supplied from the differential amplifier to an output terminal of the phase shift circuit. The phase characteristics of the phase shift circuit is equivalently controlled and the phase of the FM signal supplied to the multiplier circuit controlled, thereby preventing a demodulation output from being distorted.

REFERENCES:
patent: 4054840 (1977-10-01), Sato

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