Linearized FM quadrature detector

Details Linearized FM quadrature detector Linearized FM quadrature detector

1981-02-02

1983-03-01

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329136, 329137, 329145, 455214, H03D 314, H03D 326

Patent

active

043756182

ABSTRACT:
In an FM receiver a multiplier is driven from the IF limiter. The limiter also drives a single tuned circuit which produces a quadrature signal that drives a second port in the multiplier. When the quadrature signal is multiplied by the IF signal an FM detector results. The center frequency is determined by the frequency of the quadrature relationship and the extent of the resultant output curve is determined by the Q of the tuned circuit. The output response is linearized by varying the current in the multiplier as a function of the IF signal deviation.

REFERENCES:
patent: 4236117 (1980-11-01), Watanabe et al.
patent: 4342000 (1982-07-01), Ogita

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