Outphasing amplifier

An outphasing amplifier comprising:

• a first amplifier that amplifies a first signal;
• a second amplifier that amplifies a second signal;
• a combiner that combines the first signal amplified by the first amplifier and the second signal amplified by the second amplifier and outputs a combined signal as an output signal;
• and
• a signal processor that sets an amplitude of the second signal to be equal to or greater than an amplitude of the first signal when setting an output power of the output signal to be maximum in operation, sets the amplitude of the second signal to be smaller than the amplitude of the first signal when setting the output power to be minimum in operation, sets an outphasing angle of the first signal and the second signal when setting the output power to be maximum in operation to be larger than an outphasing angle of the first signal and the second signal when setting the output power to be minimum in operation, and outputs the first signal and the second signal,
• wherein the outphasing angle is set so that the outphasing angle decreases as the output power decreases when setting the output power within a first range including a case where the output power is maximum in operation, and
• wherein when the output power is maximum in the operation, output powers of the first amplifier and the second amplifier are saturation powers.