Amplitude and phase control device, amplitude and phase control method, amplification device, and radio transmitter

An amplitude and phase control device comprising processing circuitry

• to divide, by a signal dividing circuit, a transmission signal into a first signal and a second signal, and output each of the first signal and the second signal to a Doherty amplifier,
• to acquire, from the Doherty amplifier, a synthesized signal of a first signal amplified by the Doherty amplifier and a second signal amplified by the Doherty amplifier, perform multiplication of the synthesized signal by a reciprocal of a gain of the Doherty amplifier, and perform calculation of an error between the synthesized signal after the multiplication by the reciprocal and the transmission signal, and
• to control an amplitude of each of the first signal and the second signal depending on an amplitude coefficient corresponding to the error when a number of times of the calculation of the error reaches a predetermined number of times every time when the number of times reaches the predetermined number of times, and control a phase difference between the first signal and the second signal depending on the phase difference corresponding to the error when the number of times reaches the predetermined number of times,
• wherein the processing circuitry further calculates power of the transmission signal,
• wherein the processing circuitry controls the amplitude of each of the first signal and the second signal depending on each of the amplitude coefficient corresponding to the error when the number of times of the calculation of the error reaches the predetermined number of times every time when the number of times reaches the predetermined number of times, the power, and a carrier frequency of the transmission signal, and
• the processing circuitry controls the phase difference between the first signal and the second signal depending on each of the phase difference corresponding to the error when the number of times reaches the predetermined number of times, the power, and the carrier frequency of the transmission signal, and
• wherein the processing circuitry includes a table including a first amplitude coefficient that is an amplitude coefficient of the first signal corresponding to a combination of an error, power, and a carrier frequency, a second amplitude coefficient that is an amplitude coefficient of the second signal corresponding to the combination of an error, power, and a carrier frequency, and the phase difference corresponding to the combination of an error, power, and a carrier frequency,
• the processing circuitry acquires, from the table, the first amplitude coefficient corresponding to the combination of the error, the power, and the carrier frequency of the transmission signal, the second amplitude coefficient corresponding to the combination of the error, the power, and the carrier frequency of the transmission signal, and the phase difference corresponding to the combination of the error, the power, and the carrier frequency of the transmission signal, and outputs each of the acquired first amplitude coefficient, the acquired second amplitude coefficient, and the acquired phase difference to the signal dividing circuit, and
• the processing circuitry performs multiplication of the transmission signal before being divided by the first amplitude coefficient, and outputs the transmission signal after the multiplication by the first amplitude coefficient to the Doherty amplifier as the first signal, and
• the processing circuitry performs multiplication of the transmission signal before being divided by the second amplitude coefficient, performs addition of the phase difference to a phase of the transmission signal after the multiplication by the second amplitude coefficient, and outputs the transmission signal after the addition of the phase difference to the Doherty amplifier as the second signal.