Write driver with Schottky diodes to improve switching rate and reliability
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Jun 11, 1997
filing date -
Jun 13, 1996
priority date (Note) -
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Abstract
A write driver, having a pair of head nodes for connection to a write head, includes two diodes connected respectively the head nodes and the emitters of first and second upper drive transistors. The diodes, which are preferably Schottky diodes, increase the voltage necessary to breakdown the emitter pn junctions of the upper drive transistors, thereby enabling a greater head swing voltage, higher switching rates, and ultimately closer spacing of data on a magnetic medium. Additionally, a preferred embodiment of the write driver includes two voltage clamps, each coupled between a respective head node and a first supply node, to limit the magnitude of voltage spikes resulting from self-inductance of the write head.
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