Patent ID: 8508295
Filing Date: 2013-08-13
Classification: H03F

Abstract:
1. An amplifier that obtains an output by power combining, comprising: a distribution circuit that distributes an input signal into two signals; a first amplifier circuit that amplifies one of the two signals distributed by the distribution circuit and operates in class AB mode; a second amplifier circuit that amplifies the other of the two signals distributed by the distribution circuit and operates in class B or C operation mode; a lumped constant circuit that connects outputs of the first and second amplifier circuits and that performs impedance transformation; a first impedance transformation circuit connected to an output of the first amplifier circuit; a second impedance transformation circuit connected to an output of the second amplifier circuit; and a quarter wavelength impedance transformation circuit with one end thereof connected to a combining point of output sides of the first and second impedance transformation circuits and with the other end thereof connected to a load.