开关电容滤波器混叠效应仿真及抑制

在模拟信号调理过程中，模拟信号的滤波电路是硬件设计的关键。普通的低阶有源滤波电路无法满足传感器信号滤波电路对衰减率的要求，高阶集成开关电容滤波芯片能够实现高精度、稳定的滤波特性，但由于开关电容滤波芯片具有采样特性，不可避免地会出现混叠现象。通过对滤波芯片混叠效应的理论分析，定量地计算出后续二阶压控低通滤波电路的截止频率。实验证明，该方法能够有效抑制开关电容滤波电路出现的混叠效应。...

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Bibliographic Details
Published in电子技术应用 Vol. 40; no. 7; pp. 37 - 39
Main Author 陈海亮 刘鑫 任勇峰 瞿林
Format Journal Article
LanguageChinese
Published 太原科技大学电子信息工程学院,山西太原030024%中北大学电子测试技术国家重点实验室,山西太原,030051 2014
北京航天长征飞行器研究所,北京,100076%中北大学电子测试技术国家重点实验室,山西太原030051
Subjects
低通滤波
开关电容
混叠
阶梯噪声
混叠
阶梯噪声
开关电容
integrated switch-capacitor
low-pass filter
step noise
低通滤波
aliasing
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ISSN0258-7998

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Summary:在模拟信号调理过程中，模拟信号的滤波电路是硬件设计的关键。普通的低阶有源滤波电路无法满足传感器信号滤波电路对衰减率的要求，高阶集成开关电容滤波芯片能够实现高精度、稳定的滤波特性，但由于开关电容滤波芯片具有采样特性，不可避免地会出现混叠现象。通过对滤波芯片混叠效应的理论分析，定量地计算出后续二阶压控低通滤波电路的截止频率。实验证明，该方法能够有效抑制开关电容滤波电路出现的混叠效应。
Bibliography:Chen Hailiang ,Liu Xin, Ren Yongfeng,Qu Lin （1.Beijing Institute of Spaee Long March Vehicle, Beijing 100076, China ; 2.National Key Laboratory for Electronic Measurement and Technology, North University of China,Taiyuan 030051, China; 3.Department of Eleetrieal Information, Taiyuan University of Seienee and Teehnology, Taiyuan 030024, China）
integrated switch-capacitor ; aliasing ; low-pass filter ; step noise
In analog signal conditioning, the hardware design of analog signal filtering circuit is the key technology. The low order active filter circuit can not meet the requirement of attenuation rate in the sensor condition circuit. The high-order integrated switched capacitance filter chip can achieve high accuracy and stability. But because of the sampling characteristics of integrated switch-capacitor filter, there is aliasing phenomenon inevitably. By analyzing the aliasing effect on the filter circuit, quantitative calculation of cutoff frequency of postpositive second-order voltage-controlled low-pass fi
ISSN:0258-7998