A power amplifier

Power amplifier according to one embodiment of the invention, an amplification unit for amplifying an input signal including at least one field effect transistor (FET) serving as the amplifier stage; And a body control unit for based on the magnitude of the energy of the input signal controls the bias voltage of the body terminal of the field effect transistor; The included and the body control unit can be the larger the energy of the input signal by controlling the bias voltage to be lower body of the terminal, improving the linearity.