Preamplifing circuit for a magnetoresistance device

Details Preamplifing circuit for a magnetoresistance device Preamplifing circuit for a magnetoresistance device

1994-02-22

1995-09-19

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360113, G11B 5127, G11B 502

Patent

active

054521483

ABSTRACT:
A preamplifying circuit to amplify signals detected by a magnetoresistance device for a magnetic head. Two terminals of the magnetoresistance device are connected via a first resistor to a power source line Vcc and via a second resistor to a current input terminal of a constant current source having an output terminal which is connected to a ground line, respectively. A first capacitor is connected between the power source line Vcc and an input terminal of the constant current source. The two terminals of the magnetoresistance device are connected to bases of first and second transistors, respectively, in a differential amplification circuit. With this, because the input impedances at both terminals of the magnetoresistance device are equal, the external noise added to both of the terminals of the magnetoresistance device via parasitic capacitance become inphase. Also, the noise from the constant current source added to the base of the second transistor via the second resistor and the noise from the constant current source added to the base of the first transistor via the first capacitor and the first resistor become in-phase.

REFERENCES:
patent: 3618119 (1970-11-01), Rodriguez
patent: 4255769 (1981-03-01), Naylor et al.
patent: 4280158 (1981-07-01), de Niet
patent: 4381487 (1983-04-01), Erickson
patent: 4542422 (1985-09-01), Namiki
patent: 4706138 (1987-11-01), Jove et al.
patent: 4786993 (1988-11-01), Jove et al.
patent: 4879610 (1989-11-01), Jove et al.
patent: 5122915 (1992-06-01), Klein et al.

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