Digital Read Channel Signal Processing Method for High Density Optical Disk using PR(3, 4, 4, 3)ML and its System LSI Design

Abstract

As a high density approaches on optical disk receding, we have developed PR(3, 4, 4, 3)ML system on 8-16 modulation code under d=2 condition and implemented for PRML Digital Read Channel System LSI. When PRML is applied to optical disk, some issues apprise. These issues have solved by improving adaptive equalization system and PLL system. As a result, the improvement for play back characteristic and tilt margin for 0.2 degree were verified on the actual optical disk drive. This system LSI has introduced into 4.7GB DVD-RAM drive. Also this PRML system will be very effective way to achieve higher density on optical recording.