Electronically coupled high-impedance magnetoresistive preamplif

Details Electronically coupled high-impedance magnetoresistive preamplif Electronically coupled high-impedance magnetoresistive preamplif

1994-01-21

1995-06-20

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 66, G11B 502, G11B 503

Patent

active

054265428

ABSTRACT:
A preamplifier configured for connection to a magnetoresistive transducer makes use of a first and second transistor connected in a common emitter differential pair configuration. The differential pair configuration has a pair of input terminals and a pair of output terminals. A first feedback circuit is included for providing feedback to at least one of a pair input terminals based on selected relatively slowly changing voltages between a pair of preamplifier output terminals. In this manner, the first feedback circuit minimizes differential voltages at the preamplifier output terminals. A second feedback circuit is provided for supplying feedback to at least one of the preamplifier input terminals based on relatively low frequency voltage magnitudes at one of the pair of input terminals. In this manner, a selected common mode voltage magnitude is maintained at one of the pair of input terminals.

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