阶跃恢复二极管参数对窄脉冲波形的影响研究

阶跃恢复二极管是超宽带引信产生窄脉冲信号的核心器件,阶跃恢复二极管参数影响窄脉冲信号的幅度和宽度。依据半导体器件理论和阶跃恢复二极管不同的工作状态,建立阶跃恢复二极管模型,分析阶跃恢复二极管参数对二极管正偏导纳和反偏势垒电容的影响。根据窄脉冲产生等效电路,采用电路暂态分析方法求解窄脉冲幅度和窄脉冲宽度,仿真研究阶跃恢复二极管少数载流子寿命、反向饱和电流、零偏结电容和掺杂分布系数与窄脉冲幅度和窄脉冲宽度关系。仿真结果表明,改变阶跃恢复二极管参数可以调节窄脉冲幅度和窄脉冲宽度,通过产生的窄脉冲与仿真结果对比分析,验证了仿真结果的正确性。

Effects of Step Recovery Diode Parameters on Narrow Pulse Waveform

Step recovery diode (SRD) is the kernel of ultra-wideband (UWB) fuze generating a narrow pulse signal,and the parameters of SRD can affect the amplitude and width of narrow pulse signal.A SRD model is established based on the semiconductor device theory and SRD operating states,and the effects of SRD parameters on forward bias admittance and reverse bias barrier capacitance are studied.According to narrow pulse generating equivalent circuit,a circuit transient analysis method is used to solve the expression of narrow pulse amplitude and width.The relationships among SRD minority carrier lifetime,reverse saturation current,bias junction capacitance,doping distribution coefficient,narrow pulse amplitude and pulse width are studied through simulation.The simulated results show that the amplitude and pulse width of narrow pulse can be adjusted by changing SRD parameters.The correctness of simulated results is verified by comparing with the generated narrow pulse.