移相电路主要是由电容器的电流超前电压90度这一特性。
Rc phase-shift circuit current mainly by the capacitor voltage is 90 degrees ahead of this feature.
两路相位信号（来自一次仪表的左右传感器）的处理电路完全一样，此外还必须引出相位超前的第三路相位信号，其作用在于提醒MCU相位信号即将到达。
The third branch processes phase signal to make it precede the arrival of the other two ones. The function is to warn MCU of the arrival of right and left phase signals.
为解决探地雷达用于隧道地质超前预报时探测距离小的问题，在分析了雪崩三极管工作原理的基础上，设计了基于两级雪崩三极管串行级联的窄脉冲产生电路。
The status in quo of Impulse Ground Penetrating Radar and the general principle of Avalanche Transistor are discussed then a new method for Avalanche simulation is given in this thesis.
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