INTEGRATED CIRCUIT, OPTICAL DISC SYSTEM AND TRACKING ERROR SIGNAL GENERATION METHOD

摘要

A first comparator (112a) compares a first voltage signal to a predetermined threshold to output a first binary signal corresponding to a comparison result. A second comparator (112b) compares a second voltage signal to a predetermined threshold to output a second binary signal corresponding to a comparison result. A first digital sampling section (113a) samples the first binary signal output by the first comparator 112a to generate a first sampling signal. A second digital sampling section (113b) samples the second binary signal output by the second comparator (112b) to generate a second sampling signal. A phase difference detector circuit (114) detects a phase difference between the first sampling signal generated by the first digital sampling section (113a) and the second sampling signal generated by the second digital sampling section (113b).