Digital PLL circuit and optical disk apparatus having...

Details Digital PLL circuit and optical disk apparatus having... Digital PLL circuit and optical disk apparatus having...

2007-01-12

2009-12-08

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal phase processing

C369S059190

Reexamination Certificate

active

07630286

ABSTRACT:
An optical disk apparatus includes a binarizing circuit part for outputting a reference digital signal, and a digital PLL circuit part for outputting a write timing signal based on the reference digital signal, the write timing signal indicating a timing synchronizing with a digital clock signal having a predetermined frequency. The digital PLL circuit part includes an edge detection circuit part for detecting a rise edge and a fall edge of the reference digital signal in time resolution units in which a single period of a reference clock signal is divided into N (N where is no less than 2) intervals and outputting an edge detection signal for each the single period in accordance with the detection result, a digital clock data generating part for generating digital clock data in accordance with a phase difference indicated in an input phase difference signal in each the single period, and a phase difference detection circuit part for detecting a phase difference between the reference digital clock signal and the digital clock signal and outputting the phase difference signal indicating the detected phase difference.

REFERENCES:
patent: 2003/0016600 (2003-01-01), Hiratsuka
patent: 2004/0027940 (2004-02-01), Minamino et al.
patent: 2005/0128903 (2005-06-01), Ma et al.
patent: 60-245312 (1985-12-01), None
patent: 63-155824 (1988-06-01), None
patent: 08-274628 (1996-10-01), None
patent: 2003-209468 (2003-07-01), None

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