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摘要自动增益控制(AGC)是利用线性放大和压缩放大这两种方式的有效组合实现对信号的限幅输出的技术，在信号探测及其他相关电子领域有着广泛的应用。 本文详细讨论了适用于激光探测器的自动增益控制电路的设计及实现方法。首先给出了基于 AD603芯片的自动增益控制电路实现原理，在此基础上，根据实际应用情况及性能指标要求进行了改良与论证。接着，分别介绍了模拟通道部分，FPGA逻辑控制模块及噪声控制模块的设计思路与方法。包括它们的器件选择、实现方法和注意事项等。最后，对电路进行了实际搭建，借助于四象限探测器实验系统模拟仿真了其增益控制性能。 本文实现的电路板利用FPGA产生反馈控制信号，可实现10个不同状态档位的线性放大，拓展了探测器所能适应的入射光强的范围。在稳定信噪比的同时对输入信号起到放大的作用，输入输出信号波形均无失真现象，保证了实际应用过程中的稳定性。 43609
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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