Patent ID: 6298244
Filing Date: 2001-10-02
Classification: H03F,H03H,H04B

Abstract:
A power amplifier circuit for amplifying RF signals, said power amplifier circuit selectively operable in a linear mode or a nonlinear mode and selectively operable to amplify RF signals in a first frequency band or a second frequency band, comprising:a first driver amplifier for amplifying RF signals in a first frequency band;first and second final amplifiers;a diplex matching circuit coupled to said first final amplifier; anda switching network coupled between said first driver amplifier and said first and second final amplifiers wherein the switching network selectively couples said first driver amplifier to said first and second final amplifiers in response to said amplifier circuit being placed in a linear or nonlinear mode of operation, respectively;a low pass matching circuit coupled to an output of said second final amplifier; andswitching circuitry, coupled to a first output of said diplex matching circuit and an output of said low pass matching circuit, for selectively coupling said first diplex matching circuit output or said low pass matching circuit output to an output line when said amplifier circuit is selectively placed in linear mode or nonlinear mode, respectively.