Doherty amplification device

A Doherty amplification device comprising:

• a distributor configured to distribute, into a first signal and a second signal, an input signal after distortion compensation from a distortion compensator that performs distortion compensation for the input signal;
• a first amplifier configured to amplify the first signal;
• a second amplifier configured to amplify the second signal;
• a combiner configured to combine the first signal from the first amplifier and the second signal from the second amplifier;
• and
• an adjuster arranged between the distributor and one of the first amplifier and the second amplifier and configured to include
• a first calculation circuit configured to obtain a first characteristic that indicates a relationship of a gain of an output signal with respect to reference power of the input signal, based on the output signal output from the combiner and the input signal input to the distortion compensator,
• a classification circuit configured to classify the obtained first characteristic into a plurality of regions according to a level of the reference power,
• a second calculation circuit configured to obtain a statistical value of the gain for each of the classified regions, and
• a determination circuit configured to set, in the adjuster, a phase delay value at which distortion to be generated in the output signal output from the combiner is minimized, based on the obtained statistical value for each of the regions,
• wherein the adjuster adjusts the phase delay value of one of the first signal and the second signal from the distributor.