用于音频过采样D/A转换器∑-△调制器设计研究  

The Research and Design of Modulator for Oversampled Audio D/A Converter

作　　者：闾晓晨[1] 王小力[2] 

机构地区：[1]华南理工大学物理科学与技术学院,广东广州510640 [2]西安交通大学理学院超大规模集成电路设计研究中心,陕西西安710049

出　　处：《微电子学与计算机》2006年第2期92-95,共4页Microelectronics & Computer

基　　金：国家教育部科学技术重点项目资助(03151)

摘　　要：文章针对采样频率为44.1kHz的16位数字音频信号,采用CookBook方法,研究设计了用于过采样率为64倍的音频数模转换器的五阶3比特输出sigma-delta(!-")调制器。该调制器通带内信噪比(SNR)的matlab仿真实验结果达到了120dB以上,能够很好的抑制通带内噪声。该调制器设计结构采用前反馈和负反馈分支的!"型,大大降低了电路的复杂性,使硬件实现十分方便,具有重要的应用价值。The sigma-,delta（∑-△）modulator for oversampled audio digital-to-analog converter is studied, and the input signal of the converter is 44.1kHz and 16 bit and the oversampling ratio is 64. With the CookBook Procedure, the sigma-delta modulator with 5 order and 3-bit output signal is designed, and the SNR of the modulator in the passband simulated with matlab exceeds 120dB, so the modulator can restrain the noise in the passband effectively. The structure of modulator is noise-shaping loop using feedforward and feedback branches, which decreases the complexity of the circuit, and is easy to be implemented in hardware.

关 键 词：过采样 数模转换器 ∑-△调制器 

分 类 号：TP335[自动化与计算机技术—计算机系统结构]