Pulse count type FM demodulator

Details Pulse count type FM demodulator Pulse count type FM demodulator

1987-06-29

1989-01-24

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329123, 329126, 329145, H03D 304, H03K 906

Patent

active

048003387

ABSTRACT:
An FM demodulator having improved demodulation sensitivity, and suitable for monolithic integration. As demonstrated in various embodiments, increased sensitivity is made possible= by narrowing the demodulation band on a low frequency side. According to the various embodiments, a monostable multivibrator or first pulse generator receives an input signal and provides an output having first and second states having a combined duration equal to one period of the input signal, or alternatively equal to one-half period of the input signal. A second pulse generator, responsive to the output of the first pulse generator, generates another output having third and fourth states whose combined duration is the same as the combined duration of the first and second states. Demodulation is accomplished finally through a low-pass filter, which integrates the output of the second pulse generator.

REFERENCES:
patent: 3491305 (1970-01-01), Stone
patent: 3502995 (1970-03-01), Cottatellucci et al.

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