Offset adjusting circuit for optical disc and offset...

Details Offset adjusting circuit for optical disc and offset... Offset adjusting circuit for optical disc and offset...

2007-10-02

2007-10-02

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044290, C369S044360

Reexamination Certificate

active

10854360

ABSTRACT:
An offset adjusting circuit for an optical disc comprises a plurality of offset-adjustment differential operational amplifiers, each of the amplifiers having an input terminal to which an output signal of an optical pickup is input and another input terminal to which a control voltage is applied, an adding circuit that adds output signals of the offset-adjustment differential operational amplifiers, an A/D converter that outputs a digital signal based on an output signal of the adding circuit, and a control voltage adjuster that varies the control voltage applied to the offset-adjustment differential operational amplifiers based on the digital signal so as to remove an offset.

REFERENCES:
patent: 5189654 (1993-02-01), Minakuchi
patent: 5574714 (1996-11-01), Masashi et al.
patent: 6104682 (2000-08-01), Konishi
patent: 6181667 (2001-01-01), Mori et al.
patent: 10-105997 (1998-04-01), None

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