US Patent 7504889 Circuit for providing a signal boost

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.