Frequency controlled signal generating circuit

Details Frequency controlled signal generating circuit Frequency controlled signal generating circuit

1980-11-28

1983-06-14

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

328134, 331 11, 331 17, 331 25, 331 27, 360 51, H03L 710

Patent

active

043885969

ABSTRACT:
A circuit arrangement for generating a frequency controlled signal which is made synchronous with an input signal by an automatic phase control circuit. The circuit comprises a variable frequency oscillator for generating the frequency controlled signal and a phase comparator for generating a first control voltage based on the phase variation of the input signal, the control voltage being supplied to the variable frequency oscillator to control the frequency of the frequency controlled signal. The circuit arrangement includes a circuit for detecting a frequency difference between the frequency controlled signal and a reference signal from a reference oscillator, and a circuit for comparing the outputs from the phase comparator and the frequency difference detecting circuit to produce an additional control voltage to be mixed with the first control voltage.

REFERENCES:
patent: 3703686 (1972-11-01), Hekimian
patent: 4069462 (1978-01-01), Dunn
patent: 4191976 (1980-03-01), Braun

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