FM demodulator having a frequency independent delay circuit

Details FM demodulator having a frequency independent delay circuit FM demodulator having a frequency independent delay circuit

1988-11-21

1990-05-15

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Input signal split into plural signals

329342, 329343, 375 82, H03D 304, H03D 320

Patent

active

049261339

ABSTRACT:
An FM signal demodulator for converting the frequency of an input signal to a corresponding voltage. The demodulator includes a delay circuit responsive to the input signal for delaying the phase of the input signal by a fixed time, an exclusive-OR gate responsive to the input signal and the delayed phase signal from the delay circuit for outputting a pulse signal having a duration corresponding to the fixed time and an LPF responsive to the pulse signal for generating an output signal having a level which changes in response to changes in the frequency of the input signal.

REFERENCES:
patent: 3778727 (1973-12-01), Williams
patent: 4435682 (1984-03-01), Boudault et al.
"FM Demodulator" by Yokoyama, Home VTR Nyumon, Ch. 14, Sec. 1.15, p. 162, 1981.

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