Patent ID: 7071784
Filing Date: 2006-07-04
Classification: H03F,H03G

Abstract:
1. A composite transistor amplifier with increased linearity that provides an output current to a load, said amplifier comprising: a first transistor, wherein the base terminal of said first transistor receives an input voltage signal to be amplified and the collector terminal of said first transistor is biased with a first current source; a second transistor, wherein the base terminal of said second transistor is directly connected to the collector terminal of said first transistor, the emitter terminal of said second transistor is coupled to ground, and the collector terminal of said second transistor is biased with a second current source; a third transistor, wherein the base terminal of said third transistor is directly connected to said collector terminal of said second transistor, the emitter terminal of said third transistor is coupled to the emitter terminal of said first transistor, and said output current being derivable from the collector terminal of said third transistor; and a feed forward circuit that is coupled between the base terminal of said second transistor and said emitter terminal of said first transistor.