Overshoot current phase/amplitude control for hard disk...

Details Overshoot current phase/amplitude control for hard disk... Overshoot current phase/amplitude control for hard disk...

2006-12-26

2006-12-26

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

Reexamination Certificate

active

07154687

ABSTRACT:
Devices and methods for generating a magnetic head-specific overshoot current which is combined with an alternating current waveform into a write current used by the magnetic head to store information on a magnetic medium. A processor analyzes the frequency of incoming write data and retrieves from a data table of an overshoot current amplitude and an overshoot current phase. This amplitude and phase information is sent to an overshoot current generator to generate an overshoot current that is responsive to the dynamic impedance properties of a magnetic write head during operation. The data table may have information related to one or many write heads, and the data table may be further subdivided based on additional dynamic characteristics of a write head that may affect the impedance thereof.

REFERENCES:
patent: 6184727 (2001-02-01), Price, Jr.
patent: 6826003 (2004-11-01), Subrahmanyam
patent: 2003/0223143 (2003-12-01), Fujiwara et al.
patent: WO 01/29829 (2000-10-01), None

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