PHASE COMPARATOR AND SYNCHRONIZING SIGNAL GENERATING CIRCUIT USING THE SAME

摘要

PROBLEM TO BE SOLVED: To generate a highly precise synchronizing signal in PRML(partial response maximum likelihood). SOLUTION: In a phase error detector 20, temporary judging of a sign of a reproduced waveform is performed by a sign judging device 103, and when a judged result is (1 1) or (-1-1), a phase error signal is multiplied by α to be weighted. Phase control(PLL) is performed by using the obtained phase differential signal.