Bias circuit for magneto-resistive head

Details Bias circuit for magneto-resistive head Bias circuit for magneto-resistive head

2005-09-20

2005-09-20

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

C360S046000, C360S067000

Reexamination Certificate

active

06947238

ABSTRACT:
A bias circuit for a magneto-resistive head having a bias current output circuit for flowing a bias current through a magneto-resistive head, and a feedback circuit for controlling the bias current from a bias current output circuit by detecting voltage variation across the magneto-resistive head so that a voltage across the magneto-resistive head becomes a predetermined value. The bias current output circuit comprises a regulating circuit for regulating an operation of the bias current output circuit in the bias current output circuit, a control circuit for controlling the regulating circuit to be in a predetermined condition, and a switching circuit for switching a read/write condition for activating the control circuit for the regulating circuit in a non-read condition of the magneto-resistive head. The regulating circuit includes an oscillation suppressing capacitor; and the control circuit for the regulating circuit is a charging circuit for the oscillation suppressing capacitor.

REFERENCES:
patent: 5204789 (1993-04-01), Jove et al.
patent: 5877911 (1999-03-01), Klaassen et al.
patent: 6147824 (2000-11-01), Shibasaki et al.
patent: 6522491 (2003-02-01), Kawai

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