| 摘要 |
A 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 mode; a lumped constant circuit that connects outputs of the first and second amplifier circuits; 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 (FIG. 1).
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