Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Patent
1976-05-06
1977-09-20
Lucas, Jay P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
360113, G11B 502
Patent
active
040500861
ABSTRACT:
The ideal response expected of an electromagnetic transducer, particularly of the Magneto-Resistive (M-R) type, obtains with signal translating circuitry for amplifying the varying signal produced and for dynamically biasing the transducer for maintaining the transducing operation in the linear portions of the characteristics of both the transducer and the amplifying circuitry. An M-R transducer is connected to the input circuit of alternating signal differential amplifying circuitry for delivering the desired signal at output terminals. The offset voltage across the transducer is compensated by differentially biasing input transistors of the amplifying circuitry. Biasing direct current through and/or voltage across the M-R transducer is controlled by a circuit connected to the output terminal and responsive to the signal thereat for developing a slowly inversely varying unidirectional voltage, preferably within a low pass filter interposed in the control circuit for stability. A current handling device, conveniently a transistor having the control voltage applied to a base electrode, is connected in series with the transducer for dynamically adjusting the unidirectional biasing current flowing therethrough.
REFERENCES:
patent: 3806828 (1974-04-01), Johnson
patent: 3852813 (1974-12-01), Petersen
patent: 3979775 (1976-09-01), Schwarz
IBM Tech. Discl. Bulletin Apr. 1975 "Resistance Matching for Coupled-Film Magnetoresistive Elements" Lis & Volstyn vol. 17, No. 11, p. 3437.
IBM Tech. Discl. Bull. "Resistive Element for Bias & Noise Cancellation" Nepela & Potter p. 2759, vol. 17, No. 9.
International Business Machines - Corporation
Lucas Jay P.
Roush George E.
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