Application of Spread Spectrum for EMI Reduction In Class D Amplifier

摘要：

A spread spectrum technique and apparatus for reducing electromagnetic interference (EMI) in class D amplifier are introduced. The technique utilizes very simple hardware, where the switching frequency of a class D amplifier is dynamically varied from 1 to 1.22MHz. This is achieved by changing the charging current of an oscillator in a random fashion, through 6 switches that are controlled by 6 random digital signals. Compared to fixed frequency operation, the spectrum of a switching signal was greatly flattened and a reduction of 6dB in the EMI without efficiency and performance degradations was obtained.

作者: Haishi Wang Bo Zhang Jiang Sun Rui Wang

作者单位: State key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan, China

会议类型: 国际会议

会议名称: 2010 10th IEEE International Conference on Solid-State and Integrated Circuit Technology(第十届固态和集成电路技术国际会议 ICSICT-2010)

会议地点: 上海

会议语种:英文

页码: 129-131

在线出版日期: 2010-11-01（万方平台首次上网日期，不代表论文的发表时间）