PXI数字化仪的触发设计

PXI数字化仪在PXI速度快、价格低的基础上,增加了数据采集、处理和数据时域和频域分析的能力.触发作为数据采集系统的重要部分,可以使多通道数据采集系统同时截取各通道同一时段的一部分有用信息进行分析和处理.本文详细分析了PXI数字化仪触发单元,从硬件设计、FPGA逻辑控制与触发驱动程序设计三个方面介绍,并最终利用PXI触发总线、外部触发和模拟量作为触发源,完成了PXI数字化仪触发设计.实验完成了同一系统中多板卡间的同步触发并给出触发精度,实验表明系统运行稳定.

Trigger designin PXI bus digitizer

PXI bus digitizer has data acquisition and processing and data-domain and frequency domain analysis on the basis of the PXI speed,low price. Trigger as an important part of the data acquisition system allows multi-channel data acquisition system intercepta part of useful information for analysis and processing at the same time. In this paper,there is a detailed analysis of the PXI digitizers trigger system from the hardware design, FPGA logic control and trigger driver design,and use of PXI trigger bus, external trigger and analog as trigger source completed PXI digitizers trigger design. The completion of the experiment for synchronous trigger onmulti-board inthe same system, gives the trigger accuracy, experiments show that the system is stability.