Pulse count type FM demodulator circuit

Details Pulse count type FM demodulator circuit Pulse count type FM demodulator circuit

1979-01-24

1981-08-04

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329128, 357 14, 375 80, 455214, H03D 300, H03K 906

Patent

active

042824907

ABSTRACT:
Disclosed is a demodulator circuit which comprises a limiter circuit, a differentiation circuit, a monostable multivibrator circuit and an integration circuit. The differentiation circuit is composed of a delay circuit and a differential logic circuit. The differentiation circuit supplies the monostable multivibrator circuit with a trigger pulse whose pulse width is determined by the delay circuit. The monostable multivibrator circuit is formed of a differential circuit, having a current source at its output circuit. The current source tends to increase the output voltage of the monostable multivibrator circuit and a driving impedance for the integration circuit.

REFERENCES:
patent: 2956227 (1960-10-01), Pierson
patent: 3473133 (1969-10-01), Hummel
patent: 3493877 (1970-02-01), Jacobson
Funkschau 1970, Heft 15, pp. 500-502.
Elektor, Jul./Aug. 1972, p. 762.
Radio Fernsehen Elektronik 23 (1974), H. 15, pp. 479-482.
Thomas, "Heath's Digital FM Tuner", Radio-Electronics, May 1973, pp. 42-45, 50, 98.

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