一种应用于D类音频放大器的CMOS振荡器的设计  

A CMOS Oscillator used in High-fidelity Class D Audio Amplifier

作　　者：何钦[1] 王丹[1] 

机构地区：[1]西南交通大学信息科学与技术学院,四川成都610031

出　　处：《电子元器件应用》2012年第8期49-51,68,共4页Electronic Component & Device Applications

摘　　要：文中介绍了一种应用于低D类音频功放的CMOS振荡器结构设计,用于对音频信号的调制。振荡器采用内部正反馈的迟滞比较器设计,大大降低了电源电压和环境温度对CMOS振荡器振荡频率的影响。理论分析及仿真结果表明,此CMOS振荡器具有较高的频率稳定性。A CMOS Oscillator is proposed in this paper,which can be used in a low-EMI filter-less Class D audio amplifier. This oscillator is made up of a comparator with internal positive feedback and used for conventional PWM modulation of audio signal. We can get a high resolution CMOS RC oscillator using this structure,which could be less independent of the voltage and temperature variation. The simulation results shows that this RC oscillator have a more stable frequency.

关 键 词：振荡器 D类音频放大器 迟滞比较器 

分 类 号：TN752[电子电信—电路与系统]