Power amplifier, transceiver, and base station

Embodiments of the present invention provide a power amplifier, a transceiver, and a base station. The power amplifier comprises: a signal control unit, used for generating a mode control signal and an auxiliary power amplifier control signal; a signal processing unit, used for respectively processing an envelope signal and a radio frequency signal; an envelope modulator, used for outputting a fixed voltage or outputting an amplified envelope signal under the control of the mode control signal; a main power amplifier, used for amplifying the received radio frequency signal input from the signal processing unit; and at least one auxiliary power amplifier, which is enabled to work or disabled under the control of the auxiliary power amplifier control signal, and is used for amplifying the received radio frequency signal input from the signal processing unit when the auxiliary power amplifier is in a working state. By means of the power amplifier, the transceiver, and the base station provided by the embodiments of the present invention, the optimization of the working performance of the power amplifier is achieved.