Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Patent
1990-05-01
1992-04-07
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
360113, G11B 502, G11B 5127
Patent
active
051033534
ABSTRACT:
An amplifier circuit is disclosed for simultaneously producing electrical output signals whose magnitude is representative of signals produced by a magnetoresistive (MR) element and protecting said MR element from electrical short circuits between said element and its environment. A means including a first feedback loop biases the MR element with a bias current and amplifies a signal current for causing the MR element to produce a circuit output signal corresponding to dRh/Rh and in which any dc offset error is minimized. Rh is the resistance of the MR element and dRh is the magnetic-signal-induced change in the resistance of the MR element. A second feedback loop insures that the MR element is held at a preselected reference potential and concurrently insures that no current will flow sufficient to damage the element in event of a short circuit between the element and its environment. The feedback loops are interconnected by outputs of the respective feedback loops being commonly connected to the bases of a pair of input bipolar transistors, whose respective emitters are connected to opposite terminals of the MR element.
REFERENCES:
patent: 4706138 (1987-11-01), Jove et al.
patent: 4743861 (1988-05-01), Jove et al.
patent: 4750058 (1988-06-01), Hirt et al.
patent: 4879610 (1989-11-01), Jove et al.
Jove Stephen A.
Klaassen Klaas B.
Leonardus van Peppen Jacobus C.
Nomura Calvin S.
International Business Machines - Corporation
Kim Won Tae C.
Otto, Jr. Henry E.
Psitos Aristotelis
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