Phase locked loop stabilized against temperature and voltage var

Details Phase locked loop stabilized against temperature and voltage var Phase locked loop stabilized against temperature and voltage var

1980-12-05

1983-06-21

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, H03L 708

Patent

active

043896219

ABSTRACT:
A phase-locked loop circuit uses a voltage control oscillator which varies its frequency in response to a certain control signal. A first logic circuit generates pulses having pulse widths that are proportional to the phase differences between applied input pulses and the pulses from the oscillator. The output of the first logic circuit is filtered. Second and third logic circuits are used for generating high and low d.c. levels, respectively. The output levels of the second and third logic circuits are combined into a predetermined synthesized d.c. level. The control signal is generated, corresponding to the level difference between the outputs of the filtering means and the synthesized d.c. level.

REFERENCES:
patent: 3815042 (1974-06-01), Maunsell et al.
patent: 3944940 (1976-03-01), Desai
patent: 4055814 (1977-10-01), Abraham et al.
patent: 4155050 (1979-05-01), Nichols
patent: 4163951 (1979-08-01), Aihara et al.
Phase-Locked Loop Data Book, Motorola, Aug. 1973, pp. 1-17.
"11C44 Phase/Frequency Detector-11C00 Series," Fairchild Catalogue, Mar. 1975, pp. 1-5.
C. J. Byrne, "Properties and Design of the Phase-Controlled Oscillator with a Sawtooth Comparator," B.S.T.J., Mar. 1962, pp. 559-562.

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