摘要
三维波形映射技术提高了数字示波器的波形捕获率,但死区时间仍然广泛存在。提出了一种"分段存储集中映射"三维成像方法。根据时基将高速大容量动态存储器(DDR3 SDRAM)分成多段存储区域,连续存储多幅具有相同触发条件的波形,将DDR3 SDRAM中的多幅波形集中映射。基于双口RAM的快速波形映射技术和多路并行映射技术大大缩短了映射时间,在保证高波形捕获率的同时实现了数据的海量存储,使整个DDR3 SDRAM存储的波形时间范围内实现了无缝采集。通过建立数学模型证明了该系统能在更短时间内捕获到异常波形,双脉冲测试法测出该系统的最高捕获率为6 250 000 wfms/s,经过分析得出系统死区时间比为43.86%。
The application of three-dimensional mapping technology has improved the waveform capture rate of digital storage oscilloscopes （DSO）, however it does not eliminate the dead time of DSO. In this research, a new 3D-imaging method, fragmentation and centralized mapping, is proposed. It divides high-speed large capacity dynamic memory （DDR 3 SDRAM） into several regions based on the time-base. In each region, the waveforms with the same triggering condition are stored, and the waveforms will be post-processed with three-dimensional mapping Technology. Dual-port RAM based fast waveform mapping technology and parallel waveform mapping technology decrease the mapping time greatly. This method guarantees high waveform capture rate and enable larger data storage capacity. It also enables seamless acquisition for the duration of each stored waveform. By mathematical modeling, it can be proven that our system can capture the sporadic transient event in shorter time. Through double pulse test method, it can be demonstrated that the highest capture rate of the system is measured to be 6 250 000 wfms/s. After analysis, it is obtained that the ratio of dead time is reduced to 43.86%.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2015年第2期239-244,277,共7页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金(61301263
61301264)
中央高校基本科研基金(A03007023801217
A03008023801080)
关键词
数字三维示波器
分段存储
无缝采集
三维映射
波形捕获率
digital 3D oscilloscope
fragmentation
seamless acquisition
three-dimensional mapping
waveform capture rate
