Patent ID: 8023995

Claim:
A radio frequency device, comprising: a first amplifier that amplifies a first signal of a first modulation technique in power; a second amplifier that amplifies a second signal of a second modulation technique in power; a first matching network that is connected to an output terminal of the first amplifier; a second matching network that is connected to an output terminal of the second amplifier; a third matching network that is connected to both an output terminal of the first matching network and an output terminal of the second matching network a first path that includes a duplexer between the third matching network and an antenna, and allows the first amplifier to be coupled with the antenna through the first and third matching networks and the duplexer; and a second path that does not include the duplexer and allows the second amplifier to be coupled with the antenna through the second and third matching networks, wherein the first path is selected when the first amplifier amplifies the first signal, and the second path is selected when the second amplifier amplifies the second signal, wherein a first terminal of a switch through which the third matching network and the duplexer are electrically connected has a first impedance when the first path is selected, said first impedance being dependent on an impedance of said duplexer, wherein a second terminal of the switch at which the third matching network and the antenna are electrically connected has a second impedance when the second path is selected, said second impedance being dependent on an impedance of said switch, 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 first amplifier, wherein the second path has a fourth impedance when viewing the antenna side from the output terminal of the second amplifier, wherein the third impedance is different from the fourth impedance, and wherein the first amplifier amplifies the first signal on the third impedance, and the second amplifier amplifies the second signal on the fourth impedance.