Bias generator for a low voltage differential read amplifier

摘要

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.