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这里介绍的阶跃管脉冲整形器具有电路简单、效果良好的优点,其输出脉冲的上升和下降边沿均小于1毫微秒。阶跃恢复二极管(简称阶跃管)具有一般二极管的特性,又有自身特有的阶跃特性,即当作用在阶跃管二端的电压从正向改变为反向时,存贮在PN结两边由少数载流子堆集起来的电荷一时还不能完全消失,必须经过t_2时间(阶跃管的存贮时间)电荷才能完全消失,就在这电荷消失完了的瞬间,阶跃管突然跃变到它的反向状态,这个跃变速度非常之快,我们就利用这快速跃变的特性来形成快速脉冲。图1是整形器的原理电路,输入和输出的波形示于图2。当输入激励信号处于高电平E_1时,阶跃管
The step-pipe pulse shaper described here has the advantage of being simple and well-behaved in that the rising and falling edges of the output pulse are less than 1 nanosecond. Step recovery diode (referred to as step tube) has the characteristics of a general diode, but also has its own unique step characteristics, that is, when the role of the two ends of the step tube voltage changes from the positive to the reverse, stored in the PN junction on both sides The charge accumulated by the minority carriers can not disappear for a moment, and the charge must disappear completely after t 2 (the storage time of the step pipe). At the moment when the charge disappears, the step tube suddenly jumps to it Of the reverse state, this jump is very fast, we use this rapid transition characteristics to form a rapid pulse. Figure 1 is the shader principle circuit, input and output waveforms shown in Figure 2. Step the tube when the input excitation signal is at high level E_1