Abstract: An amplifier output stage for reducing Electromagnetic Interference (EMI) that includes an output node and an input node. A first transistor has a base terminal coupled to the input node and has a collector terminal coupled to the output node. A second transistor has a base terminal coupled to an emitter terminal of the first transistor and has a collector terminal coupled to the output node. A third transistor has a collector terminal coupled to the emitter terminal of the first transistor and the base of the second transistor and has an emitter terminal coupled to a current source and to an emitter terminal of the second transistor. A resistor has a first terminal coupled to a base terminal of the third transistor and has a second terminal coupled to the emitter terminal of the first transistor.

Abstract: Embodiments disclosed herein relate to an amplifier stage or circuit for providing a signal boost. The circuit includes an emitter-follower pair and a cross coupled differential pair. The cross coupled differential pair provides a feedback signal that provides a boost to a signal output by the emitter follower pair. In some embodiments, a capacitor of the cross coupled differential pair may be adjustable in order to vary the amount of boosting provided. In other embodiments, a current source of the cross coupled differential pair may be adjustable in order to vary the amount of boosting provided.