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Use of Command Input Shaping Method to Compensate Clock/Seed Timing Track Closure in Phase Lock Loop

By: Li, Q.; Guo, G.; Hredzak, B.; Zhang, J.;

2006 / IEEE / 0-7803-9513-1

Description

This item was taken from the IEEE Conference ' Use of Command Input Shaping Method to Compensate Clock/Seed Timing Track Closure in Phase Lock Loop ' 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 will disturb 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.