Circuit arrangement for detecting whether a predetermined freque

Details Circuit arrangement for detecting whether a predetermined freque Circuit arrangement for detecting whether a predetermined freque

1988-01-27

1989-07-25

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

307514, 328140, 329145, H03K 906

Patent

active

048517852

ABSTRACT:
A circuit arrangement for detecting whether the frequency of an input signal exceeds a predetermined frequency swing. The arrangement includes a detector circuit which supplies an error-indication signal if the phase shift between the input signal and a second signal, which second signal tracks the frequency of the input signal, exceeds limit values corresponding to such frequency swing. A delay circuit derives the second signal from the input signal by delaying the input signal a predetermined delay time which increases with the frequency of the input signal.

REFERENCES:
patent: 3778727 (1973-12-01), Williams
patent: 4403185 (1983-09-01), Charles

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