D类音频功放中线性三角波发生器设计  

Design of a Linear Triangular Waveform Generator in Class D Audio Power Amplifier

作　　者：黄武康[1] 周长胜[2] 袁国顺[1] 林福坚[2] 

机构地区：[1]中国科学院微电子研究所,北京100029 [2]中国科学院嘉兴微电子与系统工程中心,浙江嘉兴314006

出　　处：《微计算机信息》2009年第35期206-208,共3页Control & Automation

基　　金：基金申请人:周长胜;项目名称:低功耗D类音频功率放大器芯片设计;基金颁发部门:浙江省科技厅(2006C14036)

摘　　要：利用内部VDD/2基准电压产生恒定电流对电容进行充放电控制,实现了一种应用于D类功放的CMOS电流控制线性三角波发生器。理论推导和spectre仿真验证结果显示,其振荡频率与电源电压无关,而波形峰峰值随电源电压线性变化,且对结温变化、工艺漂移不敏感。电路采用CSMC0.5μm5V双阱双多晶硅CMOS工艺,测试结果表明该三角波稳定性、线性度良好。A CMOS current-controlled linear triangular waveform Generator for class D amplifier application is presented, in which constant-current sources generated from VDD /2 reference voltage are used to charge and discharge the capacitor. Theoretical derivation and spectre simulations show that, the oscillation frequency is supply-independent and the waveform peak-to-peak value is direct proportional to supply voltage, junction temperature insensitive and process deviation insensitive. The proposed circuit is realized in CSMC 0.5μm 5V twin well twin poly CMOS process, and test results show that the triangular wave is well stable and linear.

关 键 词：三角波发生器 电源无关 线性度 D类放大器 

分 类 号：TN402[电子电信—微电子学与固体电子学]