摘要
D类功放比传统的模拟功放效率高、体积小、功耗低,越来越多被用在移动电话中。文中介绍了基于脉宽调制技术的D类功率放大器EMT7026的原理和EMT7026在移动电话中的应用。通过在功放前端和后端加入滤波电路的方法降低了功放的POP噪声,实验结果显示功放输出功率为1.2W时失真度THD+N小于1%,实现了移动电话的低功耗和高音质的设计思想。
Compared with the conventional analog Audio Power Amplifier, class-D audio power amplifier is efficient, small in size and low in power consumption, and thus is widely used in mobile telephone. The principle of Class-D Audio Power Amplifier EMT7026 based on PWM technology and the application of EMT7026 Class-D Audio Power Amplifier are described. Pop noise can be reduced by appending filters before and after to the amplifier. Experiment result indicates that when the output power is 1.2 W, the THD＋N is less than 1%, thus realizing the design idea of low power consumption and high sound quality.
出处
《通信技术》
2008年第6期106-108,共3页
Communications Technology
基金
湖南省教育厅科研资助项目(编号:07D077)
