Patent ID: 8359067

Claim:
A radio frequency circuit device, comprising: an amplifier that amplifies signals of at least two modulation techniques in power, the at least two modulation techniques being different from each other; a matching network that is connected to an output terminal of the amplifier; a first path that includes a duplexer between the matching network and an antenna, and which is constructed to couple the amplifier with the antenna through the matching network and the duplexer; and a second path that does not include the duplexer and which is constructed to couple the amplifier with the antenna through the matching network, wherein the first path is selected when the amplifier amplifies first signals of the at least two modulation techniques, and the second path is selected when the amplifier amplifies second signals of the at least two modulation techniques, wherein an output impedance of the amplifier is matched with an impedance when viewing the antenna side from the amplifier in the first path and the second path, wherein a first terminal of the duplexer at which the matching network and the duplexer are electrically connected has a first impedance, wherein a second terminal at which the matching network and the antenna are electrically connected has a second impedance, wherein the first impedance is different from the second impedance, wherein the first path has a third impedance when viewing the antenna side from the output terminal of the amplifier, wherein the second path has a fourth impedance when viewing the antenna side from the output terminal of the amplifier, wherein the third impedance is different from the fourth impedance, and wherein the amplifier amplifies the first signal on the third impedance, and amplifies the second signal on the fourth impedance.