PHASE LOCKED LOOP DEVICE AND A METHOD OF A DISK DRIVER, SPECIFICALLY CONCERNED IN DETECTING A STABLE PHASE ERROR SIGNAL IN CONSIDERATION OF CODE FEATURES OF A DISK

摘要

PURPOSE: A PLL device and a method of a disk driver are provided to supply a PLL which does not consider a phase error for a reproduction signal having the shortest period of a disk or a period near to the shortest period in consideration of code features of the disk, thereby realizing a high disk recording density. CONSTITUTION: A period checker(203) checks a period of a signal reproduced from a disk. A phase detector(201) detects a phase difference between the reproduction signal and a system clock signal, and outputs the detected phase difference as a phase error. A loop filter(205) outputs a voltage corresponding to the phase error. A transmission processor(204) processes whether to transmit an output of the phase detector(201) to the loop filter(205) by the signal outputted from the period checker(203).