Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2005-01-25
2005-01-25
Tran, Sinh (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
C360S066000
Reexamination Certificate
active
06847500
ABSTRACT:
Arm electronics (AE) suitable for use in a disk drive are disclosed. The AE has write circuitry configured to operate the AE in a write mode during which a write mode supply current is drawn, and read circuitry configured to operate the AE in a read mode during which a read mode supply current is drawn. The AE uses a decaying current pulse generator that generates a decaying current pulse at the beginning of each write-to-read mode transition. The decaying current pulse has an initial value that is equal to the difference between the write mode supply current and the read mode supply current. This controlled load forces the AE to draw a gradually decreasing supply current for each write-to-read mode transition such that supply voltage transients (otherwise present due to parasitics in cabling between the AE and power supply) are reduced. Thus, the undesirable effects of such transients in the read circuitry are reduced so that write-to-read mode recovery times can be shortened.
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Jove Steven Alan
Nomura Calvin Shizuo
Vannorsdel Kevin Roy
Hitachi Global Storage Technologies - Netherlands B.V.
Kapadia Varsha A.
Oskorep, Esq. John J.
Tran Sinh
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