FM Detecting circuit

Details FM Detecting circuit FM Detecting circuit

1979-11-16

1982-10-05

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329137, 329140, 455214, H03D 300

Patent

active

043530346

ABSTRACT:
An FM signal is applied to an input of a differential amplifier including a pair of transistors having symmetrical characteristics. A 180.degree. phase shifting circuit is connected between two inputs of the differential amplifier. Accordingly, the inputs of the pair of transistors of the differential amplifier receive the FM signal, as converted into an AM signal. The respective base-emitter rectifying junctions of the pair of transistors each rectify the AM signals, as received. The emitter electrodes of the pair of transistors are commonly connected through a predetermined resistor, with the common connection point being connected to the ground through a capacitor. Accordingly, a smoothing circuit is implemented by the emitter resistor and the capacitor. A load resistor is connected to the collector electrode of one of the pair of transistors, so that a detected output is withdrawn therefrom.

REFERENCES:
patent: 3702442 (1972-11-01), Janssen et al.
patent: 3866125 (1975-02-01), Kilian
patent: 3947637 (1976-03-01), Seki et al.

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