Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1997-06-11
1999-11-16
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 68, 327110, 327312, 327314, G11B 509
Patent
active
059868325
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.
REFERENCES:
patent: 5469095 (1995-11-01), Peppiette
patent: 5539342 (1996-07-01), Gersbach et al.
patent: 5612828 (1997-03-01), Brannon et al.
patent: 5638012 (1997-06-01), Hashimoto et al.
patent: 5739706 (1998-04-01), Okamoto
patent: 5852526 (1998-12-01), Huntington
patent: 5877911 (1999-03-01), Klaassen et al.
Faber Alan
Sniezek Andrew L.
VTC Inc.
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