Patent ID: 6831799
Filing Date: 2004-12-14
Classification: G11B,H03F

Abstract:
A differential amplifier circuit for amplifying an input signal and for providing an output signal representative of the input signal, the differential amplifier circuit comprising:first and second input signal nodes; a first amplifier circuit operatively connected to the first input signal node; a second amplifier circuit including an input transistor operatively connected to the second input signal node; a first coupling circuit including a capacitor and a coupling transistor, the first coupling circuit being connected such that a base of the coupling transistor is connected to the first input signal node and the capacitor is connected between an emitter of the coupling transistor and a base of the input transistor of the second amplifier circuit; and a second coupling circuit including a capacitor and a coupling transistor, the second coupling circuit being connected such that a base of the coupling transistor is connected to the second input signal node and the capacitor is connected between an emitter of the coupling transistor and a base of the input transistor of the first amplifier circuit.