LOW DISTORTION AMPLIFIER

An amplifier includes: a first signal source that outputs a first and a second frequency signals; a second signal source that outputs the first and the second frequency signals; a first amplifier that receives and amplifies the signal output from the first signal source; a second amplifier that receives and amplifies the signal output from the second signal source; and an output combiner that combines the signals amplified by the first amplifier and the second amplifier, and operates so that a phase difference between the first frequency signals input to the first and the second amplifier amplifiers and that between the second frequency signals input to the first and the second amplifiers satisfy a relational equation in which intermodulation distortion components of those are in opposite phases.