基于PXI总线的高精度同步数据采集卡设计

The design of high accuracy simultaneous DAQ card based on PXI bus

随着科学技术的发展,军事、航空航天等众多领域对于数据采集产品的采集精度、通道间相位差要求越来越高,基于PXI总线的高精度同步数据采集卡就应运而生。该文从模拟信号调理、A/D转换、FPGA控制、PCI接口等电路详细描述了基于PXI总线的高精度同步数据采集卡的设计,并对影响采集卡的采集精度、同步性等重要指标的关键设计技术进行了深入的研究。

With the development of science and technology,the aquisition accuracy and phase deviation of DAQ in military as well as aerospace applications call for higher standard,therefore the PXI-based high accuracy simultaneous DAQ emerges as the times reguire.In this paper,the author describes the design of high accuracy simultaneous DAQ based on PXI bus from such aspects as analog signal conditioning,A/D converter,FPGA control and PCI interface,and also digs into some key design technologies which will affect aquisition accuracy and synchronization.