Patent ID: 7714648

Claim:
An amplifying system for amplifying a signal comprising: distributing means that distributes the signal; a carrier amplifier that amplifies a distributed first signal in Class AB; a peak amplifier that amplifies a distributed second signal in Class B or Class C; a first transmission line having a given electric length, the first transmission line being connected to an output of the carrier amplifier; a second transmission line having a given electric length, the second transmission line being connected to an output of the peak amplifier; and a combining end that combines an output of the first transmission line and an output of the second transmission line, wherein an impedance at the combining end is set to be different from a parallel impedance of load impedances of the carrier amplifier and the peak amplifier converted respectively by the first transmission line and the second transmission line at a maximum power, a first amplifying circuit on the carrier amplifier side includes a first preamplifier which operates in Class AB, and a second amplifying circuit on the peak amplifier side includes a second preamplifier which operates in any one of Class A to Class C.