Digital phase control circuit including an auxiliary circuit

Details Digital phase control circuit including an auxiliary circuit Digital phase control circuit including an auxiliary circuit

1979-12-21

1981-09-15

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 17, 331 27, 331DIG2, H03L 710, H03L 718

Patent

active

042900298

ABSTRACT:
A digital phase control circuit which includes a controllable oscillator, a programmable divider coupled to the oscillator, a reference frequency source, a phase discriminator coupled to the outputs of the programmable divider and reference frequency source and means coupling the output of the phase discriminator to a control input of the oscillator. In addition to these components, an auxiliary circuit is provided which has its input coupled to the output of the phase discriminator and first and second outputs coupled to the reference frequency source and the programmable divider. The auxiliary circuit generates a first signal at the input of the reference frequency source when the phase difference between the signals at the outputs of the programmable divider and the reference frequency source is in one direction and a second signal at the second input of the programmable divider when the phase difference is in the opposite direction.

REFERENCES:
patent: 3164777 (1965-01-01), Guanella
patent: 4030045 (1977-06-01), Clark
patent: 4092672 (1978-05-01), Aschwanden
Geschwinde, "Einfuhrung in die PLL-Technik" Vieweg, pp. 16-19, 38-41.

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