High peaking frequency differential cascode transformer amplifier

Abstract

Amplifiers with differential transformers for high peaking frequency are described herein. An example amplifier includes a differential transistor pair, an auxiliary transistor pair coupled to the differential transistor pair, a differential transformer coupled between base terminals of the auxiliary transistor pair, and a bias circuit coupled between base terminals of the auxiliary transistor pair. The differential transformer can be embodied as a coupled-line transformer. The bias circuit can include a first bias circuit coupled between a first coupled line of the differential transformer and a base terminal of a first transistor among the auxiliary transistor pair, and a second bias circuit coupled between a second coupled line of the differential transformer and a base terminal of a second transistor among the auxiliary transistor pair.

Dependencies are inferred from the claim text.