窄脉冲信号的峰值保持方法

Peak Holding Circuit for Fast Narrow Pulse

摘要:

针对跟踪激光雷达对回波信号峰值幅度的需求，分别采用电压型及跨导型峰值保持电路实现窄脉冲信号峰值保持，并测试了不同跨导放大器的保持效果，最终解决了激光雷达回波信号峰值保持的快速以及幅度问题。实验结果表明：采用跨导型峰值保持电路，同时利用双倍缓冲保持方法扩大保持电压峰值范围，可以实现回波信号的峰值提取。该方法采用跨导放大器实现对窄脉冲信号峰值保持的快速性，并利用双倍缓冲器提高驱动能力以及最大可保持峰值。对上升沿约为6ns的脉冲信号，可保持峰值最高达到2.5V、响应时间小于2ns。

Abstract:

In order to get the peak amplitude, different peak holding circuits with video voltage amplifier and operational transconductance amplifier were designed for fast narrow pulse. And the effects of applying different transconductance amplifiers were tested to find a better design. Simulation consequences show that, using gain of +2 closed loop buffer to expand the region of peak amplitude, the transconductance peak holding circuit is excellent. This method can curtail response time and expand working region. When the rising time of input signal is more than 6ns, the circuit can work normally even if the peak amplitude is up to 2.5V, and its response time is less than 2ns.