Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Patent
1989-12-12
1991-07-16
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
360113, G11B 502, G11B 5127
Patent
active
050329359
ABSTRACT:
A circuit for producing a signal whose magnitude is a chosen amplitude compensation characteristic of the signals produced by a magnetoresistive (MR) element comprising an input stage which produces an amplified output signal which is coupled to the output stage, and control signals proportional to the resistance of the MR element and inversely proportional to the resistance of the MR element which are coupled to a feedforward circuit. The feedforward circuit generates a chosen amplitude equalization characteristic of the signals coupled to the feedforward circuit, and this signal is coupled to a bias terminal of the output stage so that the output stage produces a signal representing the chosen amplitude compensation characteristic of the signals produced by the MR element.
REFERENCES:
patent: 4706138 (1987-11-01), Jove et al.
patent: 4786993 (1988-11-01), Jove et al.
Jove et al., "Protective Circuit for a Magnetoresistive Element", copending application Ser. No. 07/250,784, filed 09/28/88 (now U.S. Pat. No. 4,879,610).
Jove Stephen A.
Klaassen Klaas B.
Tran Long
Canney Vincent P.
International Business Machines - Corporation
Schmid, Jr. Otto
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