激光接收电路数字电位器法可变增益控制

Variable-gain Control Base on Digital Potentiometer for Laser Receiving Circuit

针对激光探测系统接收机中存在的激光回波幅度动态范围大,信号难以处理的问题,提出用可变增益放大替代传统的线性放大实现信号动态范围的压缩。比较可变增益四种实现方法的优缺点,在激光接收电路中选择使用数字电位器的方法实现可变增益控制,并分析其作用过程。通过仿真和实验验证,表明采用该方法能够有效压缩激光回波信号幅度范围,符合后续信号处理实用要求。

For the problem that it is hard to process the laser echo signal in the laser receiver because of the large dynamic range, the variable-gain amplifier is proposed to replace the tmditional linear amplifier to compress the dynamic range of laser echo signal. According to the comparison of the advantages and the disadvantages of four implementing methods of the variable gain amplifier, the digital potentiometer is selected for the laser receiving circuit and its action process is analyzed. The simulation and experiment results show that the proposed method can effectively compress the dynamic range of laser echo signal,which meets the requirerment of signal processing.