Amplification circuit

The invention provides an amplification circuit. The amplifier circuit includes: a first distributor that distributes an input signal into a first signal and a second signal; the control amplifier is used for amplifying the first signal and outputting the amplified signal as a third signal; the auxiliary amplifier is used for amplifying the second signal and outputting the amplified signal as a fourth signal; a load modulation circuit that modulates the load of the auxiliary amplifier using the third signal, synthesizes the third signal and the fourth signal, and outputs the synthesized signal as an output signal; and a stub line, the end of which is connected to a node in at least one of the first line and the second line, the stub line including a left-hand line, and the impedance at the time of a double wave is located at a first portion of a short circuit when any frequency in the operating band is taken as a fundamental wave and the impedance at the time of looking from the node to the stub line is shown