基于FPGA的多通道数据采集系统的设计

介绍了一种基于Mach XO2 4000ZE系列的FPGA芯片和模数转换芯片AD7356的多通道数据采集系统,采样率最高可达到5Msps。系统采用多个AD芯片来实现多路模拟量的实时采集。通过verilog编程语言实现FPGA芯片对AD转换的时序控制。FPGA内嵌的双口RAM作为数据缓存器来存储转换结果。通过FPGA控制单元对AD转换部分和数据缓存部分的控制可实现数据采集与数据输出的同时执行。阐述了系统的构成以及各个部分的工作原理,着重分析了FPGA控制策略和数据缓存的实现,并使用Modelsim仿真软件进行仿真与分析。

Design of the FPGA-based Multichannel Data Acquisition System

This paper presents a multichannel data acquisition system based on MachXO2 4000ZE series FPGA chip and A/D conversion chip AD7356, with a sampling rate up to 5Msps. The system adopts several AD chips to achieve real-time acquisition of multichannel analog quantity. Verilog programming language is used to realize FPGA chip''s timing control over A/D conversion. FPGA- embedded dual-port RAMs are used as data caches to store conversion results. Data acquisition and data output are performed simultaneously through FPGA control unit''s control over A/D conversion section and data caching section. Furthermore, this paper describes the structure of the system and the principle of each part, analyzes the FPGA control strategy and realization of data caching, and uses Modelsim simulation software for simulation and analysis purpose.