FM Detector using a phase shift network and an analog multiplier

Details FM Detector using a phase shift network and an analog multiplier FM Detector using a phase shift network and an analog multiplier

1979-01-31

1982-12-07

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329138, 455214, H03D 314

Patent

active

043629989

ABSTRACT:
An FM detector is constructed of a phase shift network and an analog multiplier. The analog multiplier includes a differential amplifier circuit and a phase detector circuit. The differential amplifier circuit includes differential pair transistors which are driven by FM intermediate frequency signals. One of the differential pair transistors has another transistor connected thereto which is also driven by the FM intermediate frequency signal. A collector signal of either one of the differential pair transistors is applied to the phase detector circuit through the phase shift network, while a collector signal of the other transistor is directly applied to the phase detector circuit. An emitter of the one transistor and an emitter of the other transistor are connected through resistors, whereby the signal-to-noise ratio of the FM detector is improved.

REFERENCES:
patent: 3597639 (1971-08-01), Harwood
patent: 3667060 (1972-05-01), Avins
patent: 4100500 (1978-07-01), Ohsawa et al.
patent: 4122394 (1978-10-01), Fukushima et al.

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