公开(公告)号：JP2003109334A

公开(公告)日：2003-04-11

申请号：JP2002187246

申请日：2002-06-27

Applicant: ST MICROELECTRONICS INC

Inventor： HEYDARI FEREIDOON ,  OZDEMIR HAKAN ,  ARF SADIK O

IPC: G11B20/10 ,  G11B5/596 ,  G11B20/14 ,  G11B21/10

Abstract: PROBLEM TO BE SOLVED: To provide a servo circuit containing a synchronous servo channel and a method for synchronously restoring servo data from a data storage disk. SOLUTION: A new synchronous Partial Response Maximum Likelihood (PRML) servo is provided for a high track-per-inch disk-drive system. To increase data capacity in hard disk drives (HDD), one can shorten a servo format and/or increase track density. This servo system has circuits that allow a high-performance and accurate system for positioning read-write heads. Major circuits include burst demodulation, Viterbi detection, timing synchronization, and spin-up search. A highly linear discrete-fourier-transform (DFT) burst demodulation circuit can demodulate high-density and low-signal-to-noise-ratio (SNR) position bursts.