The scheme accomplishes range tracking by adopting three range gate tracking to make middle gate always centered at echo pulse center through feedback circuit and deviation calculation circuit.
该方案采用三波门跟踪，通过偏差计算电路和反馈控制电路使中间波门中心始终对准目标回波脉冲中心，完成距离跟踪。
Adopting gate resistance increased the rise time of edge, and adopting low output resistance of driver reduced the fall time.
通过低驱动内阻对栅极电容电荷的快速泄放提高脉冲后沿的下降速度。
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