Fm detecting circuit

Details Fm detecting circuit Fm detecting circuit

H - Electricity

03

D

329/11

H03D 3/02 (2006.01) H03D 3/14 (2006.01) H03D 3/26 (2006.01)

Patent

CA 1139377

ABSTRACT OF THE DISCLOSURE An FM signal is applied to an input of a differential amplifier including a pair of transistors having symmetrical characteristics. A 180° 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 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A load resistor is connected to the collector electrode of one of the pair of transistors, so that a detected output is withdrawn therefrom.

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