自动增益控制电路设计
毕业论文关键词 自动增益控制 AGC FPGA 激光探测器 Title Automatic gain control circuit
Abstract Automatic gain control (AGC) is an effective technology which combines of linear amplification and compression amplification to achieve the limit of the output of the signal, signal detection and other related electronic fields have a wide range of applications. In this paper, the design and implementation of automatic gain control circuit which is suitable for laser detector are discussed in detail. Firstly, the principle of automatic gain control circuit based on AD603 chip is presented. On the basis of this, the improvement and demonstration are made according to the actual application situation and the requirement of performance index. Then, the design ideas and methods of the analog channel section, logic control module based on FPGA and noise control module are introduced respectively. Including their device selection, realization and notice. Finally, the circuit is built, and the gain control performance of the system is tested by the experiment system of four quadrant detector. The circuit board which is realized in this paper can use FPGA to generate feedback control signal, which can realize linear amplification of 10 different states, and expand the range of the incident light intensity. At the same time, the input signal is amplified by the stable signal noise ratio, and the waveform of the input and output signals is not distorted, which ensures the stability of the actual application process.
Keywords Automatic gain control(AGC) FPGA Laser detector
目录
1绪论1
1.1课题研究背景.1
1.3论文主要内容与结构.2
2自动增益控制电路中的关键技术基础3
2.1自动增益控制.3
2.2AGC电路的工作原理3
2.3AGC电路的分类3
2.4AGC电路的性能指标4
3自动增益控制放大器AD603...6
3.1概述.6
3.2引脚图与引脚功能描述.6
3.3内部结构及原理.7
3.4AD603级联使用.9
3.5使用注意事项...14
4基于AD603的AGC电路设计方案...15
4.1概述...15
4.2器件选择...15
4.3电路结构分析16
4.4工作过程分析...17
4.5电路总图...19
4.6小结...19
5基于三极管衰减特性的AGC电路设计方案..20
5.1概述...20
5.2器件选择...20
5.3电路结构分析21
6仿真结果与分析..26
6.1基于四象限探测器的仿真系统...26
6.2调试过程...26
6.3仿真结果...27
结论与展望..29