基于FPGA的CO_(2)色散干涉仪数据采集卡设计

Design of the CO_(2) Dispersion Interferometer Data Acquisition Card Based on FPGA

为了满足托卡马克装置放电后CO_(2)色散干涉仪中数据离线分析需求,本文设计了基于PXIe平台的数据采集卡。该采集卡选用了采样率为20MS/s的ADC,使用了FPGA作为数据传输与处理的主要芯片,通过PXIe总线以直接内存访问(Direct Memory Access)的方式将实时采集数据传输到主机端。测试结果表明,该采集系统单卡测试带宽可达到2GB/s,远远满足ADC数据80MB/s的带宽,能够稳定地将实时采集数据完整地传输到主机中,完全符合离线分析性能需求。

In order to meet the requirements of data offline analysis in CO_(2) dispersion interferometer after discharge,the data acquisition card based on PXIe platform is designed.The acquisition card selects the ADC with a sampling rate of 20MS/s,uses FPGA as the main chip for data transmission and processing,and transmits the realtime acquisition data to the host terminal by DMA through the PXIe bus.The test results show that the single-card test bandwidth of the acquisition system can reach 2 GB/s,far meeting the bandwidth of 80 MB/s of ADC data,and can stably transmit the real-time acquisition data to the host completely,fully meeting the requirements of offline analysis performance.