Patent ID: 7259624

Claim:
An amplifier for a magneto-resistive sensor, comprising: (a) first and second inputs for coupling to a magneto-resistive sensor; (b) first and second outputs; (c) a first MOS transistor and a first bipolar transistor in series with the source of said first MOS transistor connected to the emitter of said first bipolar transistor, the base of said first bipolar transistor connected to said first input and the gate of said first MOS transistor coupled to said second input, the collector of said first bipolar transistor connected to a first reference, and the drain of said first MOS connected to a first load resistor; and (d) a second MOS transistor and a second bipolar transistor in series with the source of said second MOS transistor connected to the emitter of said second bipolar transistor, the base of said second bipolar transistor connected to said second input and the gate of said second MOS transistor coupled to said first input, the collector of said second bipolar transistor connected to said first reference, and the drain of said second MOS connected to a second load resistor.