Audio amplifier, audio output circuit, audio integrated circuit, electronic device, and audio signal amplification method

摘要

An audio amplifier is disclosed. The audio amplifier for driving an electroacoustic transducer includes an H bridge circuit including a 1D-class amplifier connected to a (+) electrode terminal and a 2D-class amplifier connected to a (−) electrode terminal of the electroacoustic transducer; a pulse width modulator configured to receive an audio signal, generate a first and second pulse signal for each driving the 1D-class and the 2D-class amplifier, and adjust a phase difference between the first and the second pulse signal; a first driver driving the 1D-class amplifier depending on the first pulse signal; a second driver driving the 2D-class amplifier depending on the second pulse signal; a level detector detecting a level of the audio signal; a phase adjuster configured to set a phase difference between the first pulse signal and the second pulse signal of the pulse width modulator based on a detection result from the level detector.