Frequency demodulator employing a circuit having a delay varying

Details Frequency demodulator employing a circuit having a delay varying Frequency demodulator employing a circuit having a delay varying

1981-06-23

1984-03-06

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329126, 329145, 375 94, H03K 906, H03D 302

Patent

active

044356820

ABSTRACT:
A frequency demodulator including an "exclusive-OR" circuit receiving two square-wave signals having a frequency corresponding to a frequency-modulated signal, and a delay circuit for delaying one of the square-wave signals before application to the "exclusive-OR" circuit, by a delay varying versus frequency in such a way that the absolute value of the phase difference between the square-wave signals varies at most from 0.degree. to 180.degree. inversely with respect to changes in frequency. The output signal of the demodulator is supplied by a low-pass filter connected to the output of the "exclusive-OR" circuit.

REFERENCES:
patent: 3656064 (1972-04-01), Giles et al.
patent: 3748586 (1973-07-01), Johnson et al.
patent: 4064361 (1977-12-01), Kustka et al.
patent: 4368434 (1983-01-01), Miller et al.

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