Circuit and method for write current driver

Details Circuit and method for write current driver Circuit and method for write current driver

2006-05-01

2008-11-18

Feild, Joseph (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

C327S110000

Reexamination Certificate

active

07453659

ABSTRACT:
System and method for write current drivers for inductive heads used in mass storage drives. A preferred embodiment comprises a write current circuit coupled to an inductive write head, a MOS transistor boost circuit and a matching circuit, both coupled to the write current circuit. The write current circuit provides a first current to the inductive write head, while the MOS transistor boost circuit provides a second current for a specified duration to the inductive write head when the MOS transistor boost circuit receives a control signal. The matching circuit selectively decouples a resistive element from the inductive write head when it receives the control signal. The MOS transistor boost circuit can accelerate the transition in a switching of the polarity of the write current and the matching circuit helps to reduce ringing without negatively affecting the speed of the polarity switching by decoupling when the second current is provided.

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patent: 6297921 (2001-10-01), Price et al.
patent: 2005/0117244 (2005-06-01), Ranmuthu
patent: 2005/0231843 (2005-10-01), Venca et al.
patent: 2006/0119970 (2006-06-01), Hayashi et al.

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