Patent ID: 8598951
Filing Date: 2013-12-03
Classification: H03F

Abstract:
1. A power amplifier circuit for amplifying a radio frequency (RF) signal, the power amplifier circuit operating in at least one of a first power amplification mode and a second power amplification mode, the power amplifier circuit comprising: a first power amplification path having an input terminal and an output terminal, wherein the first power amplification path is active when the power amplifier circuit operates in the first power amplification mode; one or more second power amplification paths having an input terminal and an output terminal, wherein one of the one or more second power amplification paths is active and remaining of the one or more second power amplification paths are inactive when the power amplifier circuit operates in the second power amplification mode, the input terminal of each of the one or more second power amplification paths is coupled to the input terminal of the first power amplification path; and a first impedance matching network respectively connected between the output terminal of each of the one or more second power amplification paths and the output terminal of the first power amplification path, wherein: