A differential cascode amplifier has first and second cascode circuits, driven by two differential signal sources including input resistances.The first cascode circuit includes a first input transistor having a first collector, a first emitter, and a first base, and a first output transistor having a second collector, a second base, and a second emitter coupled to the first collector. The second cascode circuit includes a second input transistor having a third collector, a third emitter, and a third base, and a second output transistor having a fourth collector, a fourth base, and a fourth emitter coupled to the third collector. The amplifier has a first connection connecting the first base to the fourth base, and a second connection connecting the second base to the third base.This cross-connected differential cascode architecture provides doubled output bandwidth and current gain (in dB), further increasing input impedance and output swing.