Degauss control for magnetic disk-drive preamplifier
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United States of America Patent
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Oct 12, 2010
Grant Date -
Nov 19, 2009
app pub date -
May 14, 2008
filing date -
May 14, 2008
priority date (Note) -
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Abstract
One embodiment of the invention includes a preamplifier system for a magnetic disk-drive. The system includes a current distributor configured to generate a reference current and to decay the reference current from a first magnitude to a second magnitude during a degauss period to degauss a magnetic disk write head. The degauss period defines a transition from a write cycle to a read cycle of the magnetic disk-drive and has a predetermined time duration that is independent of the first magnitude of the reference current during the write cycle. An output driver is configured to provide a write current to the magnetic disk write head having a magnitude with an absolute value that is based on the reference current.
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