Phase-shifting multiplication type FM signal demodulation circui

Details Phase-shifting multiplication type FM signal demodulation circui Phase-shifting multiplication type FM signal demodulation circui

1977-01-14

1978-10-24

Martin, John C.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325487, 329103, 329110, H04B 116

Patent

active

041223942

ABSTRACT:
A phase-shifting multiplication type FM demodulation circuits comprises a gate circuit including a first and a second switching circuit adapted to be switched for an FM intermediate frequency signal, a resonance circuit and a phase-shifting element. The FM intermediate frequency signal is phase-shifted for about .pi./2 (or 90.degree.) and the phase-shifted signal (frequency) is fed to the second switching circuit of the gate circuit after the phase-conversion of the phase-shifted FM signal by means of a phase-shifter device. The demodulation circuit further includes a bias resistor for the second switching circuit which resistor serves also as a resonance resistor of the resonance circuit, a substraction circuit for detecting output signal from the gate circuit, an output resistor for determining magnitude of the output signal from the subtraction circuit, and a lowpass filter for eliminating higher harmonics from the output signal appearing across the output resistor thereby producing a demodulated output.

REFERENCES:
patent: 3311838 (1967-03-01), Danker
patent: 3701030 (1972-10-01), Gocho et al.
patent: 3866125 (1975-02-01), Kilian
patent: 3999138 (1976-12-01), Peil et al.

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