Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1975-06-27
1976-11-16
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 4, 331 17, 331172, 331179, H03B 304
Patent
active
039926796
ABSTRACT:
A stabilized frequency oscillating circuit comprises a voltage or current controlled variable frequency oscillator, a delay device receiving the output of the oscillator, an adder for adding the output of the oscillator and the delayed output of the delay device, and a detecting circuit which detects the amplitude of the output of the adder to provide a control signal which varies cyclically with changes in the oscillating frequency of the oscillator which is applied to the latter for locking the oscillating frequency of the oscillator to a predetermined or desired frequency. The oscillating circuit may further have a control circuit by which an additional control voltage or current is superimposed on the cyclically varying control signal for selecting the oscillating frequency to which the variable frequency oscillator is to be locked, or by which either the oscillator output or delayed output is phase-shifted before being applied to the adder.
REFERENCES:
patent: 3083340 (1963-03-01), Nelson
patent: 3370254 (1968-02-01), Keller
patent: 3614649 (1971-10-01), Gerig
patent: 3852681 (1974-12-01), Underhill
Eslinger Lewis H.
Grimm Siegfried H.
Sinderbrand Alvin
Sony Corporation
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