EMI noise cancellation in disk drive having MR read head and single-ended preamplifier
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United States of America Patent
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-
Jul 11, 2000
Grant Date -
N/A
app pub date -
Oct 27, 1997
filing date -
Oct 27, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Magnetic noise cancellation in a single-ended MR preamplifier front end is achieved by forming a balanced ground return path in a flex circuit connecting an MR head to the front end of the preamplifier. The balanced ground return path introduces a noise current in the opposite direction of the original noise current as viewed at the signal input pins of the preamplifier chip. In this manner common mode rejection of the radiated noise component is restored in the single-ended MR preamplifier circuit arrangement.
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