Demodulator circuit for frequency-modulated signal

Details Demodulator circuit for frequency-modulated signal Demodulator circuit for frequency-modulated signal

1979-06-04

1981-04-28

Moore, David K.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 329103, H03D 304

Patent

active

042648670

ABSTRACT:
An FM demodulator circuit particularly suited for construction as an integrated circuit is disclosed. Circuitry which may also serve the function of an intermediate frequency amplifier and limiter shapes the input FM signal into two rectangular waves having opposite phases which are applied to the bases of first and second transistors. First and second constant current sources supply substantially constant currents to the emitters of the first and second transistors, respectively, and a capacitive element is connected between the emitters of the first and second transistors. An adder circuit adds the collector outputs of the first and second transistors, and the added output is supplied to a low-pass filter to derive an analog output.

REFERENCES:
patent: 3519944 (1970-07-01), Avins
patent: 4007426 (1977-02-01), Utsunomiya

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