魏汇赞,薛文,陆锦辉

• 1:南京理工大学电子工程与光电技术学院

摘要(Abstract)：

为了满足音频信号处理中对高精度信号的需求,设计一款单环三阶一位量化CIFB结构的Σ-Δ调制器。通过对该调制器的噪声传递函数的零极点进行优化,提高调制器的精度;并通过根轨迹法对调制器的稳定性进行判定和优化,提高调制器的稳定性。根据Matlab仿真测试显示,当输入信号的带宽为20 k Hz,采样频率为5.644 8 MHz时,该调制器的峰值信噪比达到114.9 d B,有效位数为18.8 bit,最大归一化稳定输入信号幅度为-2.79 d BFS,动态范围为109 d B。这说明该调制器不但拥有较高的信噪比,同时还具有良好的动态范围,因此该调制器能够实现音频信号高精度的转换。

关键词(KeyWords)： Σ-Δ调制器;零极点优化;根轨迹法;音频信号处理;信噪比;Matlab

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(61472190)~~

作者(Author): 魏汇赞,薛文,陆锦辉

DOI: 10.16652/j.issn.1004-373x.2018.18.013

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