Phase locked loop circuit, reproduction apparatus and phase lock

Details Phase locked loop circuit, reproduction apparatus and phase lock Phase locked loop circuit, reproduction apparatus and phase lock

1998-11-16

2000-11-21

Pascal, Robert

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

369 48, 369 50, 369 59, H03L 707

Patent

active

061508888

ABSTRACT:
The invention provides a phase locked loop circuit, a reproduction apparatus and a phase locking method by which a capture range and a lock range can be widened. Before a phase locked loop circuit is locked, an output clock of a voltage controlled oscillator is counted with reference to a reference clock of a quartz oscillator, and an error component between run length limited codes reproduced from a disk and the reference clock is extracted. Then, the PLL circuit is constructed based on a result of addition of the counted value of the output clock and the extracted error component. After the phase locked loop circuit is locked, a phase error of the output clock of the voltage controlled oscillator against the run length limited codes reproduced from the disk is detected, and the PLL circuit is constructed based on the detected phase error.

REFERENCES:
patent: 4908810 (1990-03-01), Oie

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