Protective circuit for a magnetoresistive element

Details Protective circuit for a magnetoresistive element Protective circuit for a magnetoresistive element

1988-09-28

1989-11-07

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360113, G11B 502, G11B 5127

Patent

active

048796107

ABSTRACT:
A protective circuit for a magnetoresistive (MR) element having a first and a second terminal in which a first current source is coupled to the first terminal of the MR element to produce a bias current through the MR element and a second current source is coupled to the second terminal of the MR element to produce a reference current. Circuit means coupled across the MR element senses the center potential of the MR element substantially midway between the first and second terminals, and a feedback circuit responsive to the sensed center potential is coupled to adjust the current output of the first current source to maintain the center potential to a selected reference voltage to protect the MR element from short circuits to a conductive area of the magnetic recording medium. A second feedback circuit is provided which comprises a pair of transistors coupled in a differential pair configuration and a transconductance stage which feeds back a signal as a current to the transistors which keeps the dc currents through each of the transistors equal, and the transistors provide an amplified output signal which is a function of the magnetic flux being sensed by the MR element.

REFERENCES:
patent: 4492997 (1985-01-01), Arai et al.
patent: 4660113 (1987-04-01), Nomura et al.
patent: 4706138 (1987-11-01), Jove et al.
patent: 4712144 (1987-12-01), Klaassen
patent: 4786993 (1988-11-01), Jove et al.

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