Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Patent
1995-09-19
1998-02-10
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
360 46, G11B 502, G11B 509
Patent
active
057175365
ABSTRACT:
The present invention is a magnetoresistive element amplifier circuit for amplifying signals produced by a magnetoresistive element. The amplifier circuit includes a gain setting resistor and a first and second transistor. The first transistor has a pair of controlled terminals connected between first and second supply terminals and in series with the magnetoresistive element. The second transistor is connected to the first transistor in a cascode configuration. The second transistor has a pair of controlled terminals connected between the first and second supply terminals and in series with the gain setting resistor. The magnetoresistive element is in a separate DC current path from the gain setting resistor. The first and second transistors provide small signal current through the gain setting resistor for producing gain adjusted output signals.
REFERENCES:
patent: 4706138 (1987-11-01), Jove et al.
patent: 5270882 (1993-12-01), Jove et al.
Analysis and Design of Analog Integrated Circuits by P. Grey and R. Meyer, pp. 412 through 421, copyright 1977, printed in U.S.A.
Jung Peter J.
Peterson Douglas R.
Neal Regina Y.
Psitos Aristotelis M.
VTC Inc.
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