Amplification apparatus and amplification method

An amplification apparatus comprising:

• a first amplifier provided in a first branch;
• a second amplifier provided in a second branch;
• a signal separation unit configured to perform phase modulation on an input baseband signal input to the amplification apparatus according to an amplitude of the input baseband signal to thereby separate the input baseband signal into a pair of phase modulated signals of a constant amplitude, output one of the pair of the phase modulated signals to the first branch as a first branch signal, and output the other one of the pair of the phase modulated signals to the second branch as a second branch signal;
• a combining unit configured to combine an output signal of the first amplifier with an output signal of the second amplifier and output the combined signal from the amplification apparatus;
• a non-linearity compensation unit provided at an input stage of the signal separation unit and configured to multiply the input baseband signal by a non-linearity compensation coefficient for compensating non-linearity of the entire amplification apparatus;
• a first deviation compensation unit provided at an output stage of the signal separation unit and configured to multiply the first branch signal by a first deviation compensation coefficient for compensating a deviation between the first branch and the second branch;
• a second deviation compensation unit provided at the output stage of the signal separation unit and configured to multiply the second branch signal by a second deviation compensation coefficient for compensating the deviation between the first branch and the second branch;
• and
• a compensation coefficient calculation unit configured to calculate the non-linearity compensation coefficient, the first deviation compensation coefficient, and the second deviation compensation coefficient based on the input baseband signal and a feedback baseband signal obtained by feeding back the combined signal.