基于FPGA的核信号高速采集系统设计

The Design of High Speed Nuclear Signal Acquisition System Based on FPGA

低速核采集系统无法满足高精度能谱测量对核信号采集的要求。设计制作了由前端电路、高速ADC、FPGA和微控制器组成的高速采集系统。高速ADC实现核信号的最高100 MSPS离散化操作,FPGA处理实现数字核信号的高速接收、存储,并响应上位机的操作命令,实现核数据的发送等操作。通过对FPGA的静态时序分析和实时核信号的采集测试表明:该采集系统具有实时核信号的高速采集能力,可应用于高精度能谱测量场合。

Low- speed nuclear signal acquisition can＇t realize high- precision spectral measurement. The nuclear signal acquisition system based on FPGA is introduced in the paper,and the highest sampling rate can reach 100 MSPS. The system includes the front- end circuitry,high- speed ADC,FPGA processing unit and micro- controller. The high- speed ADC is used to digitize the input nuclear signal at the sampling rate of 100 MSPS. The reception and storage of the digital nuclear signal after ADC are realized in the FPGA processing unit. Besides,the FPGA is applied to response to the orders from the upper system and transfer the digital nuclear signal. The system is verified by analyzing static timing of the FPGA and testing the real- time nuclear signal. The results show that the system is suitable for real- time nuclear signal acquisition at high speed,and can be applied to high precision spectral measurement.