Patent ID: 7848714

Claim:
A radio frequency circuit apparatus comprising: a plurality of power amplifiers for amplifying a transmit signal, wherein said plurality of power amplifiers include at least two power amplifiers differing in maximum output power from each other, and wherein at least one out of said plurality of power amplifiers is used according to a communication system, wherein one out of said plurality of power amplifiers is used by itself for the transmit signal when said radio frequency circuit apparatus operates in a prescribed communication system, and said one power amplifier that is used by itself gives the largest maximum output power among said plurality of power amplifiers, and wherein said one power amplifier, when said radio frequency circuit apparatus operates in the other communication system than said prescribed communication system, is used together with at least one other power amplifier out of said plurality of power amplifiers for the transmit signal, and wherein the number of amplifying stages of said one power amplifier differs between a case in which said one power amplifier is used by itself and a case in which said one power amplifier is used together with said at least one other power amplifier.