Direct AC-coupled amplifier with improved common mode rejection for MR heads
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United States of America Patent
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May 26, 1998
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N/A
app pub date -
Sep 10, 1996
filing date -
Sep 10, 1996
priority date (Note) -
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Abstract
A direct AC-coupled amplifier for use with a plurality of magnetoresistive read elements includes a differential amplifier having first and second inputs and first and second outputs. A plurality of input circuits are provided, one for each MR element. Each input circuit has first and second connections to opposite sides of the respective MR element and a pair of emitter-follower its. Each emitter-follower circuit comprises a transistor having a base connected to one of the connections and a collector arranged to be connected a first voltage source. A capacitor is connected between the emitter of each of the transistors and a respective input of the amplifier. A current is applied to the first and second connections of a selected one of the input circuits to operate the respective MR element.
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