一种新型三极管取样门电路设计  

A novel design of triode sampling gate circuit

作　　者：石国伟 肖建[1,2] 夏天 郭宇锋[1,2] 王吉 程景清[1,2] SHI Guowei;XIAO Jian;XIA Tian;GUO Yufeng;WANG Ji;CHENG Jingqing(College of Electronics Science and Engineering,Nanjing Jiangsu 210023,China;National Local Joint Engineering Laboratory of Radio Frequency Integration and Micro Assembly Technology,Nanjing University of Posts and Telecommunications,Nanjing Jiangsu 210023,China)

机构地区：[1]南京邮电大学电子科学与工程学院,江苏南京210023 [2]南京邮电大学射频集成与微组装技术国家地方联合工程实验室,江苏南京210023

出　　处：《太赫兹科学与电子信息学报》2019年第5期924-927,共4页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(61874059)

摘　　要：超宽探地雷达在无损检测系统中应用越来越广泛,采样电路是整个无损系统设计的关键。基于等效采样原理设计出一款新的三极管取样门电路。该电路克服了现有二极管取样门电路的缺点,很好地实现采样保持。利用先进设计系统(ADS)软件对该取样门电路进行仿真,输入脉冲重复频率为10 MHz的2 ns三角波信号,采样时钟重复频率为10 MHz且与被采样信号有100 ps延时差。对其进行采样,经过该取样门电路后,输出信号为2μs。在聚四氟乙烯板上实现该电路,利用信号发生器输入一个90ns的正弦波作为被采样信号,采样时钟为100ns,经过该取样门电路后,输出信号周期为1μs。实测与理论结果都表明该电路可以降低输入信号的频率,实现利用低速A/D对高速信号的数据采集,大大降低了整个系统的成本。Ultra-wide ground penetrating radar has been more and more widely used in the nondestructive testing system, and the sampling circuit is the key to the whole non-destructive system design. A new triode sampling gate is proposed based on equivalent sampling principle. The circuit overcomes the shortcomings of the existing diode sampling gate circuit and can well achieve sample-and-hold. Using Advanced Design System(ADS) software to simulate the sampling gate, 2 ns triangular wave with 10 MHz of pulse repetition frequency is input, and a sampling pulse signal with the sampling clock repetition frequency of 10 MHz and a 100 ps delay difference with the sampled signal is utilized. After the sampling gate, the output signal is 2 μs. This circuit is implemented on FR4, and a 90 ns sine wave is input as a signal to be sampled by using a signal generator. The sampling clock is 100 ns, and the signal period after the sampling gate is 1 μs. The measured and theoretical results show that the circuit can reduce the frequency of the input signal, therefore it can use low-speed A/D to acquire high-speed signal, which greatly cut the cost of the entire system.

关 键 词：超宽带 探地雷达 等效采样 

分 类 号：TN703[电子电信—电路与系统]