Phase-control loop

Details Phase-control loop Phase-control loop

1987-07-17

1988-09-20

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 25, H03L 706

Patent

active

047728604

ABSTRACT:
In digital systems clock signals are generated from an external clock reference signal for the purpose of synchronization with the aid of a phase-control loop 1 incorporating a frequency-controllable oscillator 2. In practice synchronization problems occur due to the phase inaccuracy of these clock signals relative to the clock reference.
By a two-level control of the oscillator frequency in a plurality of cycles, located within a period of the clock reference signal, using a pulse-width modulator 12, the phase accuracy of a clock signal to be derived from the oscillator output signal is improved.
In a preferred embodiment the loop 1 comprises: storage means 16, control means 17 and selection means 18 for providing in accordance with a given phase control strategy a phase-accurate oscillator output signal, this accuracy already being obtained on a small time scale.

REFERENCES:
patent: 4179670 (1979-12-01), Kingsbury
patent: 4365210 (1982-12-01), Harrington et al.

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