The Front-End LSI with a 5-Tap PRML for 2 x Reading and Writing of BD-R/RW/ROM

Abstract

The front-end LSI having a capable of 2 x reading and writing of BD-R/RW/ROM is developed. Its readability is improved by adopting 5-tap adaptive partial response maximum likelihood (PRML) with the PR(a,b,c,d,e) type channel. Due to the proposed PRML, less than 2 x 10 -4 of the bit error rate (BER) is achieved with radial and tangential tilt margin of over ±0.6° on 25 GB disc. The method of an optimum power control (OPC) for stable writing of various BD-R/RW is proposed. The presented chip contains 14-million transistors in a 60 mm 2 dies, and is fabricated in 0.18 μm CMOS technology.