Bias generator for a low voltage differential read amplifier

Details Bias generator for a low voltage differential read amplifier Bias generator for a low voltage differential read amplifier

1993-02-25

1995-03-14

Shepperd, John

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

350 61, G11B 1512, G11B 1514

Patent

active

053981448

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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