文档介绍：本科毕业设计说明书
自动增益控制放大系统设计
ON THE DESIGN OF AUTOMATIC GENERATION CONTROL
自动增益控制放大系统设计
摘    要
自动增益控制电路已广泛用于各种接收机、录音机和信号采集系统中,另外在光纤通信、微波通信、卫星通信等通信系统以及雷达、广播电视系统中也得到了广泛的应用。
本课题主要研究应用于音频放大的前级电压放大,因此设计的电路需容纳的频带范围应较宽,以至于使语音信号通过。由于语音信号的频带范围为300hz-3400hz,所以该电路所应设计的频带范围应在300hz-3400hz之间,并且电路应该实现增益的闭环调节,通过此电路可以实现增益的自动调整,以至于使音频信号强时自动减小放大器的倍数,信号弱时自动增大放大器的倍数,从而实现音量的自动调节。
本课题介绍了自动增益控制的概念原理以及自动增益控制放大系统各部分的工作原理,最后对系统的测试结果以及设计与实现中应该注意的问题也做了详细分析。
关键词: 放大器;自动增益控制; 电压跟随器; 滤波器
ON THE DESIGN OF AUTOMATIC GENERATION CONTROL
ABSTRACT
The automatic gain control electric circuit has been widely used in all kinds of receivers、tape recorders and signal gathering systems, and also been used munications system radar, the broadcast television system and optical munications, munications, munications.
This topic mainly studies to the applies to the front level voltage amplification of the audio frequency amplification, therefore the frequency band scope of the electric circuit should be wider that can make the pronunciation signals to pass. Because the frequency band scope of the pronunciation signal is 300 Hz-3400 Hz, so the frequency band scope of our electric circuit should be designed within 300 Hz-3400 Hz. And the electric circuit should realize the closed loop adjustment which increases, it may realize the automatic control through this electric circuit which increases when the tonic train signal is strong automatically that it can reduce the multiple of the amplifier, and when the signal is weak that it can automatically increase the amplifier the multiple, so that can realize the volume with automatic control.
This topic also introduced in the concept principle of the automatic gain control as well as to automatically increases the system every part of principle of work the detailed introduction, and it pays attention to the question to the test result of this system .Finally we have make some analysis to the design.
KEYWARDS:Amplifier; Automatic Gain Control; AGC;Voltage follower;F