Patent ID: 8279010

Claim:
A radio frequency (RF) power amplifier, comprising: a first amplifier which amplifies an RF signal; a second amplifier which amplifies the RF signal; a third amplifier which amplifies the RF signal; a first matching circuit connected to an output node of said first amplifier; a second matching circuit connected to an output node of said second amplifier; a third matching circuit connected to an output node of said third amplifier; an output terminal connected to an output node of said first matching circuit; a first switching element having one end connected to an output node of said second matching circuit; a second switching element having one end connected to an output node of said third matching circuit; and a first power supply line which is connected between an other end of said first switching element and an other end of said second switching element, and is for supplying power to said second amplifier via said first switching element and said second matching circuit and supplying power to said third amplifier via said second switching element and said third matching circuit, wherein the other end of said first switching element is connected to an input node of said first matching circuit, the other end of said second switching element is connected to the input node of said first matching circuit via said first power supply line, and an impedance at an output side of said RF power amplifier as viewed from the output node of said third amplifier is higher than an impedance at the output side of said RF power amplifier as viewed from the output node of said second amplifier.