FM detector with reduced distortion

Details FM detector with reduced distortion FM detector with reduced distortion

1989-08-28

1990-05-15

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329336, 329337, 455214, 455312, H03D 314

Patent

active

049261320

ABSTRACT:
An FM detection circuit utilizes a first multiplier and phase shift circuit to demodulate an FM signal. The output signal also contains harmonic distortion as a result of the demodulation process. A gain control circuit is included to provide a first gain control signal to the first multiplier which adjusts the magnitude of the output signal of the FM detection circuit in such a manner as to substantially eliminate the harmonic distortion. The gain control circuit uses a second multiplier to generate an output signal proportional to the square of the output signal of the phase shift circuit which is then compared to a constant current to produce an error signal proportional to the harmonic distortion. The error signal controls the magnitude of the first gain control signal such that the output signal of the FM detection circuit is proportional to the deviation of the FM signal from its center frequency.

REFERENCES:
patent: 4375618 (1983-03-01), Jett, Jr.
patent: 4656432 (1987-04-01), Matsummura

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