Patent ID: 7161429

Claim:
A differential amplifier comprising: a first cascode circuit comprising: a first input transistor comprising a first collector, a first emitter, and a first base; and a first output transistor comprising a second collector, a second base, and a second emitter coupled to the first collector; a second cascode circuit comprising: a second input transistor comprising a third collector, a third emitter, and a third base; and a second output transistor comprising a fourth collector, a fourth base, and a fourth emitter coupled to the third collector; a first connection that connects the first base to the fourth base; and a second connection that connects the second base to the third base, wherein the first connection comprises a first direct current (DC) biasing circuit that generates a first DC potential difference between the first base and the fourth base, and wherein the second connection comprises a second DC biasing circuit that generates a second DC potential difference between the second base and the third base.