多路AGC放大器闭环控制系统设计  

Design of Closed-loop Control System with Multi-channel AGC Amplifier

作　　者：高加林[1] 薛海英[1] 杨翠侠[1] 杨侃[1] 

机构地区：[1]北方通用电子集团有限公司微电子部,江苏苏州215163

出　　处：《新技术新工艺》2015年第2期31-33,共3页New Technology & New Process

摘　　要：针对现有多路光电探测器配置的多级增益控制方式的缺点进行了分析,提出采用AGC放大方案克服多级增益变化所带来的缺点的思路。针对光电探测器输出的多路低占空比和窄脉冲信号特点,设计采用加权法获取多路信号之和,利用采样保持电路和A/D转换器获取加权后的和脉冲信号幅度,并经微控制器计算得到增益反馈控制量,最后反馈到电压控制型可变增益放大器的控制端,调整光电探测器输出信号的幅度,从而提高探测器的探测精度和稳定性。Aimed at the shortcomings of the multilevel gain control mode in the existing multi-channel optical-electronic detector, a scheme that uses automatic-gain control （AGC） was proposed to solve these shortcomings. Focused on the char- acteristics of the detector＇s multi-channel low duty circuit and narrow pulse signal, the sum of multi-channel signals was ob- tained by using the weighting method and the pulse signal amplitude after weighting was obtained by using sample and hold circuit and A/D converter. Then the control quantity of gain feedback was calculated by the microcontroller. Finally, the control quantity was fed back to control end of the voltage-controlled variable gain amplifier to adjust the amplitude of the output signal for the optical-electronic detector. The objective of the above design was to improve the detection accuracy and stability of the detector.

关 键 词：多路探测器 AGC放大器 闭环控制 窄脉冲 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]