Direct AC-coupled amplifier with improved common mode rejection

Details Direct AC-coupled amplifier with improved common mode rejection Direct AC-coupled amplifier with improved common mode rejection

1996-09-10

1998-05-26

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 46, 360 66, G11B 509, G11B 503, G11B 502

Patent

active

057575665

ABSTRACT:
A direct AC-coupled amplifier for use with a plurality of magnetoresistive read elements includes a differential amplifier having first and second inputs and first and second outputs. A plurality of input circuits are provided, one for each MR element. Each input circuit has first and second connections to opposite sides of the respective MR element and a pair of emitter-follower its. Each emitter-follower circuit comprises a transistor having a base connected to one of the connections and a collector arranged to be connected a first voltage source. A capacitor is connected between the emitter of each of the transistors and a respective input of the amplifier. A current is applied to the first and second connections of a selected one of the input circuits to operate the respective MR element.

REFERENCES:
patent: 4833559 (1989-05-01), Belk
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patent: 5426542 (1995-06-01), Smith
patent: 5434717 (1995-07-01), Yoshinaga et al.
patent: 5452148 (1995-09-01), Kawai et al.
patent: 5548453 (1996-08-01), Sasaki et al.
patent: 5598128 (1997-01-01), Veit et al.
patent: 5623378 (1997-04-01), Shibasaki et al.

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