OFFSET ADJUSTMENT CIRCUIT FOR OPTICAL DISK, INTEGRATED CIRCUIT, OPTICAL DISK DEVICE, AND OFFSET ADJUSTMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide an offset adjustment circuit for an optical disk capable of effectively utilizing the dynamic ranges of respective circuits for processing signals subjected to offset adjustment. SOLUTION: The offset adjustment circuit 110 for the optical disk is equipped with at least differential operation amplifiers OPe and OPf for offset adjustment in which the output signal of an optical pickup is inputted to one input terminal and a control voltage is applied to the other input terminal, an A/D conversion section AD which outputs a digital signal on the basis of the output signals of the differential operation amplifiers for offset adjustment, and a control voltage adjusting section LO which can vary the control voltage to be applied to the differential operation amplifiers for offset adjustment on the basis of the digital signal in order to remove the offset. COPYRIGHT: (C)2005,JPO&NCIPI