Patent ID: 7489202
Filing Date: 2009-02-10
Classification: H03F

Abstract:
1. A radio-frequency (RF) amplifier comprising: a first transistor of a first type, said first transistor having a control terminal and first and second conduction terminals, wherein said first conduction terminal of said first transistor couples to a node adapted to provide a first common potential; a second transistor of said first type, said second transistor having a control terminal and first and second conduction terminals, wherein said second conduction terminal of said first transistor couples to said first conduction terminal of said second transistor; an RF choke coupled between said second terminal of said second transistor and a node adapted to provide a second common potential; an in-phase drive circuit configured to provide in-phase versions of an RF input signal to said control terminals of said first and second transistors; and a control terminal bias network coupled to said control terminals of said first and second transistors and to said first and second common potential nodes, said control terminal bias network being configured to establish substantially equal DC voltages across said first and second conduction terminals of each of said first and second transistors.