采用巧妙的电路结构和模拟信号处理方式, 设计了一种从杂波中提取弱小脉冲信号的电路。首先对输入信号进行饱和放大, 然后分两级进行滤波。将一级滤波输出信号与二级滤波输出信号在比较器中进行比较, 从而产生脉冲信号, 输出脉冲宽度可调。该电路结构简单, 使用元器件较少, 便于小型化。采用厚膜工艺加工制作该电路。结果表明, 该电路的脉冲宽度误差为1.0%, 输出脉冲延迟时间为51 ns。该电路具有检测弱小信号能力强、脉冲宽度变化小、抗干扰强、体积小、功耗低、一致性好等特点, 适用于批量生产。

By using a clever circuit structure and analog signal processing method, a circuit was designed to extract weak pulse signal from clutter. Firstly, the input signal was saturated and amplified, and then filtered in two stages. The output signal of the primary filter was compared with the output signal of the secondary filter in the comparator, so as to generate the pulse signal, and the output pulse width was adjustable. The structure of the circuit was simple and the use of fewer components was convenient for miniaturization. The circuit was processed by thick film technology. The results showed that the pulse width error of the circuit was 1.0% and the output pulse delay time was 51 ns. The circuit had the characteristics of strong ability to detect weak signal, small change of pulse width, strong anti-interference, small size, low power consumption and good consistency, and it was suitable for mass production.