摘要
为了实现高频信号在欠采样条件下的波形重构,步进延迟脉冲信号的产生成为顺序等效时间采样技术用于触发取样系统进行高频信号采样的关键。为此,对精细延时方法进行研究,采用斜波比较的方法设计了一种精细步进延时系统,该系统基于微波三极管的开关特性,结合恒流源、充放电电路、高速电压比较器以及可编程DAC产生可调步进延迟时间的触发序列。对该系统进行仿真分析以及实验测试。实验结果表明,电容放电的线性区域下降沿时间为10 ns,幅度为4~7 V,与DAC比较后输出延迟脉冲的步进范围为10 ns,单位步进延迟精度可达1 ps。该斜波比较精细步进延迟系统可应用于取样示波器、矢量网络分析仪等测试仪器中,实现通信、雷达等信号探测与分析,对于高频信号的获取与分析具有重要意义。
In the process of achieving waveform reconstruction of high⁃frequency signals under the condition of undersampling,the generation of step delay pulse signals becomes critical for the sequential equivalent time sampling technique used in triggering sampling systems for high⁃frequency signal acquisition.Therefore,this paper strives to study the method for precise delay.The ramp comparison method is used to design a precision step delay system.On the basis of the switching characteristics of microwave transistors,this system integrates constant current sources,charge⁃discharge circuits,high⁃speed voltage comparators and programmable DAC to generate trigger sequences with adjustable step delay times.The system underwent simulation analysis and experimental testing.The experimental results demonstrate that the linear region of capacitor discharge has a falling edge time of 10 ns and an amplitude of 4~7 V.After the comparison with DAC,the step range of the output delay pulse is 10 ns,with a unit step delay accuracy of 1 ps.The precision step delay system based on ramp comparison can be applied in instruments such as sampling oscilloscopes and vector network analyzers,which enables communication and radar signal detection and analysis.To sum up,the proposed system is of significant importance for acquiring and analyzing high⁃frequency signals.
作者
卫晨博
张敏娟
胡媛媛
刘文艳
王旭阳
WEI Chenbo;ZHANG Minjuan;HU Yuanyuan;LIU Wenyan;WANG Xuyang(School of Information and Communication Engineering,North University of China,Taiyuan 030051,China;Research Institute of Frontier Interdisciplinary Sciences,North University of China,Taiyuan 030051,China)
出处
《现代电子技术》
北大核心
2025年第3期155-160,共6页
Modern Electronics Technique
基金
山西省自然科学基金项目(202303021211163)。
关键词
高频信号
波形重构
等效时间采样
高精度步进延迟
斜波比较
微波三极管
high⁃frequency signal
waveform reconstruction
equivalent time sampling
high⁃precision step delay
ramp comparison
microwave triode
