FPGA的多通道时域均匀采样系统研究

Research on Multi-channel Time-domain Uniform Sampling System Based on FPGA

设计了一种基于FPGA的多通道多采样率的数据均匀采编系统。系统以Spartan6系FPGA为主控制器。硬件部分采用三阶有源低通滤波对信号进行抗混叠处理,确保数据采集的精确性;逻辑设计部分读取ROM地址表,将不同采样率信号通过模拟开关以1137 ns的切换频率送入真12位模/数转换芯片,实现高效采集时序。经过实物测试,对于不同档位模拟信号均可实现采集精度优于0.5%的高精度采集,完全符合设计要求,目前已应用于实际生产中。

In the paper, a multi-channel multi-sample rate data uniform collection and editing system is designed based on FPGA for the accuracy requirements of signal acquisition of the acquisition system.The system is based on the Spartan-6 series FPGA as the main controller.The hardware part: the third-order active low-pass filtering is used to anti-alias the signal to ensure the accuracy of data acquisition.The logic design part: reading the ROM address table sends the signals of different sample rates to the true 12-bit analog-to-digital conversion chip at a switching frequency of 1 137 ns through the analog switch to achieve efficient acquisition timing.After physical testing, for different gear analog signals can achieve high-precision acquisition with a acquisition accuracy of better than 0.5%,which fully meets the design requirements and has been applied to actual production.