D型音频功率放大器的IC设计  

IC Design of Class D Audio Amplifier

作　　者：张思敏[1] 傅科成[1] 冯勇建[1] 

机构地区：[1]厦门大学物理与机电学院,福建厦门361005

出　　处：《仪表技术》2011年第5期31-34,共4页Instrumentation Technology

基　　金：福建省重大科技资助项目(2010H6025)

摘　　要：D型功率放大器以其体积小、效率高的优点延长了系统的电池寿命,文章针对D型放大器的优点,设计了一款高效率、低失真的D型音频功率放大器。通过建立负反馈提高放大器的线性度与电源纹波抑制比;最小化系统的失真要求高速采样,芯片设计了高速比较器来满足这一要求;同时,根据工作需要,芯片的带隙基准设计具有较低的温度系数,较高的电源抑制比。Class D audio amplifier can extend battery life for its small cubage and high efficiency.In connection with the advantages of Class D audio amplifier,a class D audio amplifier with high efficiency and low distortion is designed in this paper.A negative feedback is established to improve the linearity of the amplifier and power supply ripple rejection.Minimizing the distortion of the system requires high-speed sampling.High-speed comparator is designed to meet this requirement.Moreover,the work requires that the chip has a band-gap reference with low temperature coefficient and high power supply rejection ratio.

关 键 词：D类放大器 带隙基准 三角波发生器 

分 类 号：TN386.1[电子电信—物理电子学]