高精度数据采集电路设计及通道交叉干扰分析

发布时间：2018-04-08 21:13

本文选题：高精度　切入点：通道干扰　出处：《电子器件》2017年03期

【摘要】：为满足多路远距离电流信号高精度采样的需求,设计了一种基于FPGA的高精度多通道数据采集存储电路。分析了测量电路各模块误差产生的原因,用电路等效理论推导了多通道采集时通道间交叉干扰引入的测量误差,从设计角度出发,提出了减小误差提高测量精度的方法。对设计的多通道采集电路进行了多次测试实验,测试结果表明,采集电路可实现对8路4 m A~20 m A电流信号高精度采集测量,测量精度优于0.1%。
[Abstract]:In order to meet the demand of high precision sampling of multi-channel remote current signal, a high-precision multi-channel data acquisition and storage circuit based on FPGA is designed.In this paper, the causes of the errors in various modules of the measuring circuit are analyzed, and the measurement errors caused by the cross-interference between channels in multi-channel acquisition are deduced by using the circuit equivalent theory. From the point of view of design, a method to reduce the errors and improve the measurement accuracy is put forward.Many tests are carried out on the designed multi-channel acquisition circuit. The test results show that the acquisition circuit can realize the high precision acquisition and measurement of 8 channels of 4mA20 Ma current signal, and the measuring accuracy is better than 0.1.
【作者单位】：中北大学仪器科学与动态测试教育部重点实验室;
【基金】：动态测试技术重点实验室开放基金(ZDSYSJ2015004)
【分类号】：TN791;TP274.2

【相似文献】