Method and circuit for generating a tracking error signal...

Details Method and circuit for generating a tracking error signal... Method and circuit for generating a tracking error signal...

2007-01-09

2007-01-09

Dildine, R. Stephen (Department: 2133)

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

C369S030220, C369S033010, C369S044320, C369S044410

Reexamination Certificate

active

10697102

ABSTRACT:
A circuit for generating tracking error signal using differential phase detection, comprising a quadrant photodetector for receiving optical signal and inducting splitting signal A, splitting signal B, splitting signal C and splitting signal D, two adders for generating group signal (A+C) and group signal (B+D). A plurality of equalizers for receiving, equalizing and amplifying splitting signal A, splitting signal B, splitting signal C, splitting signal D, group signal (A+C) and group signal (B+D). A plurality of phase detectors for receiving the output of equalizers and comparing phase difference of splitting signal A and group signal (A+C), group signal (A+C) and splitting signal B, splitting signal C and group signal (B+D), and group signal (B+D) and splitting signal D, and outputting a plurality of adjustment signals respectively. A circuit for eliminating the phase difference by adding and subtracting some adjustment signals with same phase difference. A comparator for receiving and comparing the output of the circuit to obtain a tracking error signal.

REFERENCES:
patent: 6345020 (2002-02-01), Cho et al.
patent: 6977982 (2005-12-01), Ma et al.
patent: 6992953 (2006-01-01), Sato et al.
patent: 2004/0160866 (2004-08-01), Huang et al.

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