多通道高精度数据采集电路的设计与实践

The Design and Practice of Multi-channel High-precision Data Acquisition Circuit

本文结合实际应用工程,给出了多通道高精度数据采集电路的硬件设计和控制时序的设计。将理论计算和实践相结合,详细介绍了信号采集电路的设计,采用模拟开关进行通道的切换,对运放的输出稳定性进行了分析和验证;采用FPGA作为逻辑控制器,给出了程序设计流程和控制时序,并结合大量实验,给出了AD7667驱动运放的最优设计。测试表明,该整体设计实现了对72路模拟信号的高精度(0.1%)采集和编码,满足了工程实际需求,并已应用到实际环境中的参数采集。

In this paper,with the practical application of project,the design of multi-channel high-precision data acquisition circuit and control timing was given.Combining the theoretical and practical,the detailed design of the signal acquisition circuit was introduced,and the output stability of op amp was analyzed and verified by using analog multiplexer for channel switching.With FPGA as a logic controller,gave the design process of program and control timing.And combining with a large number of experiments,gave the optimal design of driving op amps of AD7667.As showed in testing,the whole design has realized the acquisition and encoding of 72 channels of analog signal with high-precision（0.1%）,meeting the actual need of the project.It has been applied to the acquisition of parameters in the actual environment.