A high gain, current driven amplifier uses an emitter follower circuit with another emitter follower circuit connected in a feedback configuration to drive a common base amplifier circuit in place of a conventional cascode amplifier configuration to achieve a high frequency response with adequate signal gain. A differential input signal can be used, thereby minimizing input DC offsets, drift and noise, by using a differential amplifier to convert a differential input signal voltage to the input signal current for driving the emitter follower circuits. The current gain is determined by a ratio of the resistances in the emitter circuits of the emitter follower circuits. In one embodiment, the currents formed in the emitter follower circuits are summed at the input to the common base amplifier circuit, while in another embodiment, such currents are summed at the output of the common base amplifier circuit.