Current-sense bias circuit for a magnetoresistive head and...

Details Current-sense bias circuit for a magnetoresistive head and... Current-sense bias circuit for a magnetoresistive head and...

2007-07-31

2007-07-31

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

C360S046000

Reexamination Certificate

active

10748985

ABSTRACT:
The present invention provides a current-sense bias circuit for use with a magnetoresistive head. In one embodiment, the current-sense bias circuit includes a voltage biasing portion configured to provide a bias voltage across the magnetoresistive head thereby establishing a bias current through the magnetoresistive head. Additionally, the current-sense bias circuit also includes a current sensing portion coupled to the voltage biasing portion and configured to sense a change in the bias current based on a resistivity change of the magnetoresistive head.

REFERENCES:
patent: 6226137 (2001-05-01), Ngo
patent: 6420910 (2002-07-01), Contreras et al.
patent: 6532127 (2003-03-01), Ranmuthu et al.
patent: 6606212 (2003-08-01), Klaassen et al.
patent: 2002/0030916 (2002-03-01), Patti et al.
patent: 2003/0227704 (2003-12-01), Takayoshi et al.

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