Bias generator for a low voltage differential read amplifier
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United States of America Patent
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Mar 14, 1995
Grant Date -
N/A
app pub date -
Feb 25, 1993
filing date -
Feb 25, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is a read amplifier that is configured for interconnection with a magnetic head through head contacts. The read amplifier includes a differential transistor pair that is connected in a common emitter configuration. The bases of the differential transistor pair are connected across the magnetic head. A bias generator provides a bias current to the bases of the differential pair of transistors through first and second input resistors. The bias generator includes a circuit for providing a compensation voltage to the bases of the differential transistor pair that is based on changes in the bias current supplied to the differential transistor pair.
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