基于高速ADC的TOF-SIMS数据采集系统  

High speed ADC based data acquisition system for TOF-SIMS

作　　者：杨佳祥 龙涛[2] 邱春玲[1] 包泽民[2] 王培智[2] 刘敦一[2] Yang Jiaxiang;Long Tao;Qui Chunling;Bao Zemin;Wang Peizhi;Liu Dunyi(College of Instrumentation and Electrical Engineering,Jilin University,Changchun 130021,China;SHRIMP Center,Institute of Geology Chinese Academy of Geological Sciences,Beijing 102206,China)

机构地区：[1]吉林大学仪器科学与电气工程学院,吉林长春130021 [2]中国地质科学院地质研究所北京离子探针中心,北京102206

出　　处：《电子技术应用》2018年第8期82-85,共4页Application of Electronic Technique

基　　金：国家重大科学仪器设备开发专项项目(2011YQ05006906;2011YQ05006902)

摘　　要：设计了一种适用于飞行时间二次离子质谱仪(TOF-SIMS)的数据采集系统。系统使用高速模数转换(ADC)芯片对模拟信号进行采样,以FPGA作为时序控制器,采用DDR3 SDRAM进行数据缓存,通过PCI-Express(PCIE)总线与上位机进行高速数据传输,并对ADC动态性能和PCI-Express总线的读写速度进行测试。结果表明,系统采集频率为400 MHz的正弦信号时,ADC的信噪比为56.333 d B,总谐波失真为-63.509 d B,有效位数为8.995 bit;PCI-Express总线写速度为1 135 MB/s,读速度为1 002 MB/s。测试结果满足TOF-SIMS仪器需求。This article designed a data acquisition system for Time-of-Flight Secondary Ion Mass Spectrometer（ TOF-SIMS）. The system uses high speed Analog-to-Digital conversion（ ADC） for sampling of analog signals. The timing controller is FPGA. The DDR3 SDRAM is used to store massive amounts of data. PCI-Express（ PCIE） bus is used to communicate with computer, and the ADC dynamic performance and PCI-Express bus read and write speed are tested. The results show that the system acquires the sine wave with the frequency of 400 MHz, the signal to noise ratio of ADC is 56. 333 d B, the total harmonic distortion is-63. 509 d B,the effective number is 8. 995 bit, and PCI-Express bus has write speed of 1 135 MB/s and read speed of 1 002 MB/s, which meet needs of the TOF-SIMS.

关 键 词：飞行时间二次离子质谱仪 高速数据采集 高速模数转换 PCI-Express总线 

分 类 号：TN98[电子电信—信息与通信工程]