Different Structures of Audio Power Amplifiers

Abstract

In recent years, the world's technological advancements have been continuously improving, with semiconductor technology developing rapidly. As a result, power amplifier circuits have also seen rapid development and widespread application. There are various types of power amplifier circuits, among which the one specifically designed for amplifying audio is the audio power amplifier. Serving as an electronic amplifier, the audio power amplifier can amplify low-power electronic audio signals to levels capable of driving devices, making its presence noticeable in many audio systems. Understanding audio amplifiers better can enhance the sound quality of audio equipment, improve device power efficiency, and reduce energy waste. Therefore, researching audio power amplifiers is crucial. Many factors affect the operation of audio power amplifiers, with the most important being the structure of the audio power amplifier. Through the study of the A, B, AB, and D structures of audio power amplifiers, it can be observed that AB class amplifiers mix the characteristics of A and B class amplifiers and are widely used, while D class amplifiers operate as switch-mode amplifiers, with a more complex design but extremely high efficiency.