用于瞬态高强度辐射场探测的单次快脉冲采集系统  

Sampling system for transient signals in a high-intensity radiation field

作　　者：程晓磊[1,2] 李斌康[2] 范如玉[1,2] 田晓霞[2] 阮林波[2] 田耕[2] 

机构地区：[1]清华大学工程物理系,北京100084 [2]西北核技术研究所,西安710024

出　　处：《清华大学学报（自然科学版）》2009年第11期1745-1748,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八六三"高技术项目(2007AA01Z275)

摘　　要：介绍了在瞬态高强度辐射场中精确获取ns量级的单次快脉冲的意义,分析了采集这类电脉冲信号的技术难点,并针对其难点设计了一种能精确获取其信号全波形的高速采集系统。系统的采样率为1GS/s,模拟输入带宽最大500MHz,8位分辨率,采样点数可达3×105以上,通过其内部独特的自触发式提前采样设计,能对瞬态脉冲的快前沿实现精确的定时和完整的采集。最后,对研制完成的系统进行了信号完整性测试和性能标定,并对前后沿均为5ns、脉宽10ns的单次脉冲进行采集。从实验结果可知,该脉冲信号的前沿部分被完整地记录下来,并且脉冲的波形几乎没有产生畸变。A precise acquisition method was developed for the nanosecond transient signals in pulsed radiation fields. A high-speed sampling system was designed to precisely reassure the entire waveform of these signals. This 8 bit system has a 1 GS/s sampling rate, 500 MHz analog input bandwidth and a large memory space of over 300 kB. This system accurately recognizes the rising-edge of the transient signal through ＂forward sampling＂ without a trigger signal. The dynamic characteristics of the system have been evaluated with a transient signal having 5 ns rise time and fall times and a pulse width of 10 ns. The entire rising edge of the signal was recorded with no noticeable distortion.

关 键 词：单次快脉冲 提前采样 时钟抖动 信噪比 

分 类 号：TN78[电子电信—电路与系统]