基于场效应管与阶跃恢复二极管的皮秒级脉冲源设计

摘要

针对已有脉冲源无法兼顾脉冲宽度和幅值的现象,提出一种基于场效应管(MOSFET)和阶跃恢复二极管(SRD)相结合的皮秒级脉冲源设计方案.通过研究分析传统的几种脉冲源的设计方案,设计出一种百伏级的高重频皮秒级脉冲发生器,在PSPICE上对设计方案进行仿真并制作出脉冲源PCB板,实测在2MHz的重频下产生半幅脉宽约为400 ps、幅度110 V以上的极窄脉冲,波形稳定,为高分辨的超宽带探测雷达发射机的设计提供了新的选择方案.%As the existing pulse source can not balance pulse width and amplitude,a scheme of based on field effect transistor (MOSFET) and step recovery diode (SRD) combined with picosecond pulse source was put forward.Analyzing traditional designs of several pulse sources,we designed a high repetition rate picosecond pulse generator of 100 volt level and made a design simulation with PSPICE and developed the pulse source PCB board.Measurement shows 2 MHz repetition rate,half amplitude width 400 ps around,range above 110 V and stable waveform.The scheme providedes a new selection for high resolution UWB detection radar transmitter.