Head IC that adjusts the amplitude level of a read signal of a head
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United States of America Patent
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Dec 28, 2010
Grant Date -
May 14, 2009
app pub date -
Sep 2, 2008
filing date -
Nov 9, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A head IC, which adjusts an amplitude level of a read signal of a head, for outputting to a read channel having an AGC amplifier, includes: a differential amplifier; an AGC circuit; external gain setting sections; and a switch. Since the AGC amplifier is disposed in the head IC, the amplitude from the head is automatically adjusted in the head IC, and the signal level, which enters the input dynamic range of the AGC amplifier of the read channel, can be adjusted. The AGC amplifier can be operated as a fixed gain amplifier using a gain value which is set from the outside, so the power consumption can be minimized even if automatic adjustment is performed.
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