Chin Kwan Thum

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Conventional add-on feedback filters that are designed to compensate for midfrequency (mid-<i>f</i> ) repeatable runout (RRO) in a hard disk drive (HDD) servo system either have a long filter transient or constitute a large sensitivity hump as well as poor stability margins. This paper presents a novel linear time-varying (LTV) group filtering scheme for(More)
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