FM Detecting circuit

Details FM Detecting circuit FM Detecting circuit

1980-03-28

1982-07-27

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329130, 329139, 455214, 455337, H03D 314, H03D 326

Patent

active

043420001

ABSTRACT:
In an FM detecting circuit of either the ratio detecting circuit type or the quadrature detecting circuit type arranged to have an LC resonance circuit and to detect the amount of deviation of an FM input signal relative to the resonance frequency by utilizing the resonance characteristic of the LC resonance circuit in the vicinity of the resonance frequency to thereby perform FM detection, a semiconductor element is connected to the LC resonance circuit to expand the rectilinear region of the resonance characteristic and to reduce detecting distortions.

REFERENCES:
patent: 2572424 (1951-10-01), Amos
patent: 2710350 (1955-06-01), Van Dijkum
patent: 3130372 (1964-04-01), Zajac
patent: 4225975 (1980-09-01), Iwamoto

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