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A Method of Selecting Filter Coefficient for Robust Data to Clock Equalizer in Optical Disc Drive

광 디스크 드라이브의 강인한 데이터-클럭 등화기 필터계수 선정

  • 염동회 (군산대학교 PostBK21 지능형 임베디드 인력 양성사업팀) ;
  • 김진규 (군산대학교 전자정보공학부) ;
  • 주영훈 (군산대학교 제어로봇시스템공학과)
  • Received : 2010.01.04
  • Accepted : 2010.01.30
  • Published : 2010.04.01

Abstract

The equalizer compensates a signal distorted by transmission lines and amplifying stages, so the signal can have uniform characteristics over all frequency range. The equalizer in ODD(Optical Disc Drive) improves the stability of the extracted clock from a received signal and the readability of an inserted disc by suppressing noise and ISI(Inter-Symbol Inference). The length of marks-spaces and track pitch on discs becomes shorter as the recording density of an optical media is higher, which causes noise and ISI. And, the sensitivity about the fluctuation of physical systems is higher as the optical devices become more complicate. This paper proposes a method to select the coefficient of built-in equalizer of ODD in order to maintain the quality of signals against noise and ISI caused by system fluctuation.

Keywords

Equalizer;noise;Inter-symbol inference;Golden section search;Jitter margin;Phase locked loop

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