A CMOS 4× speed DVD read channel IC

Abstract

Optical disk is a data storage medium of the highest density, and is widely used for compact disk and digital versatile disk (CD/DVD) players and read-only memory and random-access memory (ROM/RAM) drives. In this work, all functions for 1/spl times/ speed DVD read channels are integrated on a single 0.8-/spl mu/m CMOS chip. A ninth-order pulse slimming equalizer with two zeros is made programmable to cover a frequency range of over five octaves from 0.7 to 25 MHz with high-frequency boost of 12 db and group delay variation of less than /spl plusmn/3%. A one-beam tracking error detector features six allpass delay equalizers with a tunable delay range of 93 ns at 2 MHz. Other control functions integrated on the chip are three-beam tracking error generator, laser power control circuit, and detectors for track crossing, disk defect, signal envelope, focus error, etc. The chip occupies 25 mm/sup 2/ and consumes 500 mW at 5 V.