Signal detection circuit

Details Signal detection circuit Signal detection circuit

1975-04-18

1976-04-20

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 12, 331 25, H03B 304

Patent

active

039522610

ABSTRACT:
A signal detection circuit for determining synchronism and asynchronism in a phase synchronization circuit having a loop consisting of a first phase detector, a loop filter and a voltage controlled oscillator, has a second phase detector for input signals of the phase synchronization circuit and output signals of the voltage controlled oscillator. The output of the second phase detector is supplied to a low pass filter and a level judgment circuit. The level judgment circuit includes a Schmitt trigger circuit with two threshold levels due to hysteresis effect to reduce misjudgments when the input signals are low signal to noise signals.

REFERENCES:
patent: 3440540 (1969-04-01), Hane et al.
patent: 3564434 (1971-02-01), Camenzind et al.

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