摘要
针对某项目多通道数字变换器的设计,提出了一种高可靠性、高精度的模数转换方案。为完成12路传感器信号的采集、4路电压电流的采集,对硬件电路进行了详细的分析与优化。待采集信号先后通过信号调理、模拟开关、分压跟随以及抗混叠滤波对其进行处理,并对链路的建立时间进行分析,最后采用逐次逼近型AD芯片进行转换,通过与上位机配合验证数据的采集精度。经过大量实验数据验证,采集精度均能优于0.5%,达到任务要求。
In this paper,a high-reliability and high-precision analog-to-digital conversion scheme is proposed for the design of a multi-channel digital converter in a project.In order to complete the collection of 12 channels of sensor signal and the collection of 4 channels of voltage and current,the hardware circuit is analyzed and optimized in detail.The signal to be collected is processed by signal conditioning,analog switch,voltage division follow-up and anti-aliasing filtering,and the establishment time of the link is analyzed.Finally,the successive approximation AD chip is used for conversion.Verification of data collection accuracy through cooperation with the host computer.After a lot of experimental data verification,the collection accuracy can be better than 0.5%,meeting the task requirements.
作者
李建翔
杨玉华
刘东海
李秋媛
Li Jianxiang;Yang Yuhua;Liu Donghai;Li Qiuyuan(Key Laboratory of Instrumentation Science and Dynamic Measurement of Ministry of Education,North University of China,Taiyuan 030051,China;National Key Laboratory for Electronic Measurement Technology,North University of China,Taiyuan 030051,China)
出处
《电子技术应用》
2021年第6期105-109,114,共6页
Application of Electronic Technique
关键词
模数转换
高精度采集
信号调理
模拟开关
抗混叠滤波
逐次逼近型
analog-to-digital conversion
high precision acquisition
signal conditioning
analog switch
anti-aliasing filtering
successive approximation register
