一种可调延时超窄脉冲触发序列产生技术

An adjustable delay time ultra-narrow pulse trigger sequence generation technique

为了实现高频信号在欠采样条件下的波形重构,递进延时超窄触发信号的产生成为顺序等效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,设计了一种可编程延时触发序列产生及调理电路,在FPGA数字电路的控制下,通过计数器与延时模块产生可调延时触发序列,利用阶跃恢复二极管特性对产生的触发序列进行调理,产生一种延时步进可调、边沿极窄的脉冲信号。通过对该电路进行测试,结果表明,输出脉冲信号步进范围0~-2.4 ns可调,分辨率可达1 ps,且边沿跳变时间可以达到120 ps内,幅度可达到8 V左右。该延迟脉冲和调理电路可应用于通信、雷达等信号探测设备中,对于高频信号的获取与分析具有重要意义。

In order to realize the waveform reconstruction of high-frequency signals under under-sampling conditions,the generation of progressive delay ultra-narrow trigger signals has become the key to the use of sequential equivalent sampling techniques for high-frequency signal sampling in trigger sampling systems.To this end,a programmable delay trigger sequence generation and conditioning circuit is designed.Under the control of the FPGA digital circuit,an adjustable delay trigger sequence is generated through the counter and delay module,and the step recovery diode characteristic is utilized to condition the generated trigger sequence to produce a pulse signal with adjustable delay step and extremely narrow edge.By testing the circuit,the results show that the output pulse signal step range is adjustable between 0~2.4 ns,the resolution can be up to 1 ps,the edge jump time can reach within 120 ps,and the amplitude is about 8 V.The delayed pulse and conditioning circuit can be applied to communications,radar and other signal detection equipment,and has great significance for the acquisition and analysis of high-frequency signals.