Low-voltage, low-power amplifier for magnetoresistive sensor
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United States of America Patent
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Dec 14, 1993
Grant Date -
N/A
app pub date -
Jul 15, 1992
filing date -
Jul 15, 1992
priority date (Note) -
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Abstract
Low noise, low power, low voltage amplifier circuits with a single ended input having no common mode rejection for concurrently biasing and amplifying signals generated by magnetoresistive (MR) elements in a disk file. The amplifier circuits comprise a single (grounded) supply voltage source. One terminal of each MR element and the conductive substrate of each MR element and the conductive substrate of each disk in the disk file are grounded to minimize transient conductive asperity currents. The head/disk assembly of the disk file is completely enclosed by a highly conductive electrostatically shielded metallic enclosure that operates as a Faraday cage and isolates leads connecting the MR elements with the amplifier circuit from large, fast rise/fall time voltage transients.
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