Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2008-08-27
2010-11-30
Negrón, Daniell L (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
C360S067000
Reexamination Certificate
active
07843659
ABSTRACT:
A head IC adjusts an amplitude level of a read signal of a head and outputs the adjusted signal to a read channel having an AGC amplifier. A head IC includes: a differential amplifier; an AGC circuit; external gain setting sections; and a switch. The AGC amplifier is disposed in the head IC, and the amplitude from the head is automatically adjusted in the head IC. The signal level can be adjusted within the input dynamic range of the AGC amplifier of the read channel. An estimated gain value converted from a result of measuring a resistance value of the head is used as an initial value for the adjustment of the AGC amplifier. It becomes possible attempting to prevent an increase in the lock-in times of the AGC, to guarantee stability, and to prevent judgment errors of the AGC.
REFERENCES:
patent: 5955921 (1999-09-01), Ide et al.
patent: 6018554 (2000-01-01), Glover
patent: 2008/0100944 (2008-05-01), Matsui et al.
patent: 2008/0123212 (2008-05-01), Amemiya
patent: B2 2624842 (1997-06-01), None
patent: A 10-21647 (1998-01-01), None
Greer Burns & Crain Ltd.
Holder Regina N
Negrón Daniell L
Toshiba Storage Device Corporation
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