基于带宽交织采样架构的80 GSps超宽带实时采集系统  

Ultra-wideband data acquisition system with 80 GSps based on bandwidth interleaved architecture

作　　者：赵禹[1] 叶芃[2] 孟婕 黄武煌[1] 杨扩军[1] Zhao Yu;Ye Peng;Meng Jie;Huang Wuhuang;Yang Kuojun(University of Electronic Science and Technology of China,Chengdu 611731,China;Shenzhen Institute for Advanced Study,University of Electronic Science and Technology of China,Shenzhen 518110,China)

机构地区：[1]电子科技大学,成都611731 [2]电子科技大学(深圳)高等研究院,深圳518110

出　　处：《仪器仪表学报》2024年第5期147-156,共10页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(62201125,62371097)项目资助。

摘　　要：利用8片10 GSps的模数转换器(ADC)芯片,基于带宽交织采样架构设计并且实现了具有80 GSps,20 GHz带宽的超宽带实时数据采集系统。对带宽交织采集系统中的子带分解、多子带间采集同步、交叠带以及全频带拼合等一系列问题展开了研究,并基于分治法的思想提出了相应的校准以及补偿方法,补偿前后的时域以及频域分析对比证明了提出补偿方法的有效性。实验结果表明,系统实现了具有80 GSps采样率、20 GHz带宽指标,其中有效位数(ENOB)以及无杂散动态范围(SFDR)在20 GHz处可以达到6 bit以及40 dB,并给出了系统ENOB随频率变化的曲线,采集系统上升时间为22 ps,实验数据表明系统各项指标处于国内领先水平。This article uses eight 10 GSps ADCs to design an ultra-wideband high-speed data acquisition(DAQ)system with 80 GSps and 20 GHz bandwidth based on the bandwidth-interleaved(BI)sampling architecture and applies it to a real-time digital storage oscilloscope(DSO).Research is implemented on sub-band decomposition,acquisition synchronization between multiple sub-bands,overlapping bands,and full-band splicing.Based on the divide and conquer method,corresponding calibration and compensation methods are proposed.The comparative analysis is conducted within both the time and frequency domains,prior to and subsequent to the implementation of the compensation technique,and substantiates the efficacy of the proposed method.The findings from the experiment show that the DAQ system attains a sampling rate of 80 GSps and a bandwidth of 20 GHz.The system ENOB and SFDR could reach 6 bits and 40 dB at 20 GHz,and the changing curve of ENOB with frequency is given.The rise time of the acquisition system is 22 ps.Experimental data show that the system’s various indicators are at the leading domestic level.

关 键 词：超宽带数据采集 带宽交织 并行同步采样 频响补偿 

分 类 号：TH7[机械工程—仪器科学与技术]