Disk drive comprising an offset-nulling amplifier for detecting a back EMF voltage of a voice coil motor
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United States of America Patent
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May 31, 2005
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N/A
app pub date -
Mar 31, 2003
filing date -
Mar 31, 2003
priority date (Note) -
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Abstract
A disk drive is disclosed employing an offset-nulling amplifier for detecting a back EMF voltage of a voice coil motor (VCM) in a velocity mode servo control system. The offset-nulling amplifier comprises a differential amplifier, an input stage for swapping the polarity of the input voltage at a periodic interval, and an output stage comprising a single-ended amplifier having an input switched at the periodic interval between the positive and negative outputs of the differential amplifier.
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