Title :
Use of Command Input Shaping Method to Compensate Clock/Seed Timing Track Closure in Phase Lock Loop
Author :
Li, Q. ; Zhang, J. ; Hredzak, B. ; Guo, G.
Author_Institution :
Data Storage Inst., Singapore
Abstract :
In all servo writing technologies used in hard disk drives industry, servo track propagation process has to be synchronized using clock/seed timing track in order to ensure proper alignment of the propagated servo patterns. Before the clock/seed timing track can be used to synchronize the servo propagation, clock/seed timing track closure must be guaranteed. Incorrect closure disturbs the operation of the phase-lock loop circuit and adversely affect the quality of the propagated servo patterns. This paper proposes a novel method for fast compensation of clock/seed timing track closure. The method is based on command input shaping technique. A compensation signal is injected between phase detector and low pass filter of the phase-lock loop circuit to compensate the clock/seed timing track closure. Experimental and simulation results verifying the proposed method are presented
Keywords :
low-pass filters; phase locked loops; servomechanisms; timing circuits; clock-seed timing track closure; command input shaping method; compensation signal injection; hard disk drives industry; low pass filter; phase detector; phase lock loop circuit; servotrack propagation process; servowriting technologies; Circuits; Clocks; Detectors; Hard disks; Phase detection; Servomechanisms; Synchronization; Timing; Tracking loops; Writing;
Conference_Titel :
Industrial Electronics and Applications, 2006 1ST IEEE Conference on
Conference_Location :
Singapore
Print_ISBN :
0-7803-9513-1
Electronic_ISBN :
0-7803-9514-X
DOI :
10.1109/ICIEA.2006.257170