Low-noise preamplifier for magneto-resistive heads

Details Low-noise preamplifier for magneto-resistive heads Low-noise preamplifier for magneto-resistive heads

1990-09-26

1992-06-16

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Head

Hall effect

360 67, G11B 5127, G11B 502

Patent

active

051229153

ABSTRACT:
A preamplifer for use with a magneto-resistive playback head in which a d.c. current source provides current through a field effect transistor and the magneto-resistive element to ground. An operational transconductance amplifier included in a feedback loop provides a bias voltage for the field-effect transistor, whereby the voltage across the said magneto-resistive element is held constant while the resistance of said element changes. The resulting a.c. current flowing through the magneto-resistive element flows only through the feedback loop and an output resistor connected across the inputs of the operational transconductance amplifier. The amplification of the circuit is approximately the resistance of the output resistor divided by the resistance of the magneto-resistive element.

REFERENCES:
patent: 4833559 (1989-05-01), Belk
patent: 4879610 (1989-11-01), Jove et al.

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