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目前应用于便携设备中的音频功率放大器,主要分为AB类和D类两种,它们的主要区别就是放大器分别工作在线性区和非线性区。AB类功放性能好,成本低,但效率不高,因此主要应用在小功率输出场合。而D类功放由于工作在开关状态,可以获得很高的效率,特别适合大功率大音量输出的场合,但D类功放应用中也伴随着EMI干扰的问题。随着技术的发展及绿色节能的要求,D类放大器将获得更多的应用。
At present, audio power amplifiers used in portable devices are mainly classified into AB and D, and their main difference is that the amplifiers work in a linear region and a non-linear region respectively. Class AB amplifier performance, low cost, but not efficient, so mainly used in low-power output occasions. The Class D amplifier due to work in the switch state, you can get very high efficiency, especially for high-power large-volume output of the occasion, but also with Class D power amplifier applications EMI interference problems. With the development of technology and the requirements of green energy-saving, Class D amplifier will get more applications.