双踪示波器设计中的采样率自适应分配技术  

Self-adaptive allocation technology of sampling rate in design of dual-trace oscilloscope

作　　者：张凯[1,2] 李晨杰 刘豫东 金明[2] 顾斌[2] 吴珊珊[2] ZHANG Kai;LI Chenjie;LIU Yudong;JIN Ming;GU Bin;WU Shanshan(Jiangsu Province R&D Center of Electronic Information Engineering Technologies,Nanjing 210023,China;School of Electronic Information Engineering,Nanjing College of Information Technology,Nanjing 210023,China)

机构地区：[1]江苏省电子信息工程技术研发中心,江苏南京210023 [2]南京信息职业技术学院电子信息学院,江苏南京210023

出　　处：《现代电子技术》2017年第17期154-157,共4页Modern Electronics Technique

基　　金：江苏省工业信息化委员会2015年立项科技项目:智能空间的普适服务系统平台研究与建设;江苏高校品牌专业建设工程资助项目(PPZY2015C242)

摘　　要：基于奈奎斯特采样定理和FPGA器件设计了一款采样率自适应分配的双踪数字示波器。采用双通道共享双A/D,按照输入信号带宽比自适应分配二通道采样率的方案,有效地解决了传统模式下二通道采样率无法相互调剂的弊端,从而显著提高了示波器的带宽上限和采样效率。在总采样率约束下,较传统采样模式,带宽上限提高近2倍,对高斯分布下的信号带宽采样效率提高约1.5倍。Based on the Nyquist sampling theorem and FPGA devices,a sampling rate adaptively-allocating dual-trace digital oscilloscope was designed.The two channels sharing dual A/Ds are adopted to allocate two channels′sampling rates in accordance with the bandwidth ratios of input signals,and overcome the disadvantage that the sampling rates cannot be mutually supported between two channels in the traditional mode,thereby the bandwidth upper limit and sampling efficiency of the oscilloscope are significantly raised.Under the constraint of the total sampling rate,the upper limit of the bandwidth is nearly doubled,and the sampling efficiency is increased by roughly1.5times for signals′bandwidths in Gaussian distribution,in comparison with the traditional sampling mode.

关 键 词：示波器 带宽 采样 自适应 FPGA 

分 类 号：TN702-34[电子电信—电路与系统]