Low noise voltage-biasing amplifier for magnetoresistive element

Details Low noise voltage-biasing amplifier for magnetoresistive element Low noise voltage-biasing amplifier for magnetoresistive element

1991-01-13

1993-04-20

Pascal, Robert J.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360113, G11B 502, G11B 5127

Patent

active

052047890

ABSTRACT:
A circuit for concurrently producing low noise electrical output signals which are amplified representations of signals produced by a magnetoresistive (MR) element and protecting said element from electrical short circuits which can occur between said element and its environment. A first feedback loop comprises (a) an input amplifier for amplifying a signal current from the MR element and (b) a source of bias current for biasing the MR element with a bias voltage. An input amplifier is concurrently biased by said current and amplifies a signal current from the MR element for producing a circuit output signal corresponding to dRh/RhRh and in which any differential direct current (dc) output offset error is minimized. (RhRh is the square of the time-averaged resistance of the MR element and dRh is the magnetic-signal-induced change in the resistance of the MR element.) A second feedback loop, electrically in series with the first feedback loop, biases the MR element toward a preselected reference potential and concurrently prevents flow of a current sufficient to damage the MR element in the event of a short circuit occurring between the MR element and its environment (e.g. the recording surface of a magnetic recording disk).

REFERENCES:
patent: 4050086 (1977-09-01), Harr
patent: 4706138 (1987-11-01), Jove et al.
patent: 4712144 (1987-12-01), Klaassen
patent: 4786993 (1988-11-01), Jove et al.
patent: 4879610 (1989-11-01), Jove et al.
patent: 5032935 (1991-07-01), Jove et al.
patent: 5103353 (1992-04-01), Jove et al.
patent: 5122915 (1992-06-01), Klein et al.

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