取样信号的质量是等效时间采样技术的关键.在对多个高频信号同时进行采集时,需要同步度较高的超快沿脉冲作为触发取样信号.本文利用阶跃恢复二极管的反向恢复时间极短的特性,设计了超快沿窄脉冲压缩电路以及三阶威尔金森功分器,将时基信号进行增益放大与下降沿压缩后进行等功率分配,最终驱动两路微波取样器对高速信号进行采集.实验结果表明,输出的两路脉冲信号下降沿均幅度达到了7 V,且下降沿时间可以达到150 ps以内,双路间延迟小于20 ps.
Design and Implementation of Dual-channel Ultrafast Edge Synchronous Sampling
The quality of the sampling signal is key to the equivalent-time sampling technique.When multiple high-frequency signals are acquired simultaneously,ultrafast edge pulses with a high degree of synchronization are required as trigger sampling signals.In this paper,taking advantage of the extremely short reverse recovery time of the step recovery diode,we designed an ultrafast edge narrow pulse compression circuit and a third-order Wilkinson power divider to amplify the gain of the time-based signal and com-press the falling edge for equal power distribution,and finally drive two microwave samplers to collect the high-speed signal.The experimental results show that the average amplitude of the falling edge of the two pulse signals reaches 7 V,and the falling edge time can be less than 150 ps,and the delay between the two channels is less than 20 ps.
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