Magnetoresistive head amplifier

Details Magnetoresistive head amplifier Magnetoresistive head amplifier

1992-10-07

1994-07-19

Mullins, James B.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

307309, 330252, G11B 502

Patent

active

053314786

ABSTRACT:
An amplifier for biasing and amplifying the signals produced by a magnetoresistive element is provided. The input stage of this circuit includes two transistors in a differential common base configuration having a low input impedance. Since the two transistors are coupled to separate identical current sources, balance between the currents through the two transistors is maintained. The currents are balanced without the use of a feedback loop. Additional input stages may be added to allow signals from additional magnetoresistive elements to be selected and amplified. By using a common mode switching configuration, switching transients are greatly reduced.

REFERENCES:
patent: 4706138 (1987-11-01), Jove et al.
patent: 4833559 (1989-05-01), Belk

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