摘要本学位论文课题来源于某系统接收机设计需求,依据任务书给出的技术条件,提出了一个30MHz中频放大器的设计方案,并且对于所提方案进行了具体的的设计、仿真与实现。结果表明,3阶谐振器耦合式带通滤波器的工作中心频率为30MHz,通带带宽为500KHz;基于AD603的两级放大电路最大增益可以达到77dB;AGC控制电路可以使得放大器的动态范围达到40dB;电压跟随器可以在电路的前级与后级之间起到隔离缓冲的作用。最后通过对实际电路进行测试,验证设计方案的可行性,结果表明所设计的中频放大器具有良好的滤波特性、较大的增益和动态范围,符合课题要求。80397
毕业论文关键词 中频放大器 窄带带通滤波器 AD603 AGC 电压跟随器
毕业设计说明书外文摘要
Title Design and application of 30MHz intermediate frequency amplifier
Abstract This dissertation topic is based on the design requirements of a certain receiver system 。According to the technical requirements given by the task document,the paper proposed a design of a 30MHz intermediate frequency amplifier and finished the specific design, simulation and implementation。It turns out that the 3 order resonator coupled band pass filter has a center operating frequency of 30MHz,and its pass band is 500KHz。The two stages amplifier circuit consists of AD603 and its maximum gain can reach 77dB。The AGC circuit can expand the dynamic range of IFA to 40dB。And the voltage follower serves as an insulator and a buffer between the front stage and the back stage of the circuit。Finally, by testing the practical circuits, the feasibility of the design is verified。 The results show that the design of the IF amplifier has a good filtering characteristics, a great gain and dynamic range。Therefore,the design meet the requirements of the project。
Keywords intermediate-frequency amplifier narrow band-pass filter AD603 AGC voltage follower
目 次
1 绪论 1
1。1 课题背景及研究意义 1
1。3 论文的工作内容和结构安排 1
2 课题的总体设计方案 3
3 带通滤波器的设计与仿真 4
3。1 滤波器的基本概念与选取 4
3。2 滤波器的设计方法 5
3。3 带通滤波器的设计步骤 6
3。4 带通滤波器的仿真与分析 11
3。5 本章小结 18
4 基于AD603的AGC放大电路设计 19
4。1 AD603芯片 19
4。2 基于AD603芯片的AGC放大电路设计 23
4。3 本章小结 30
5 电压跟随器的设计 32
5。1 电压跟随器的实现方式 32
5。2 OPA842芯片实现电压跟随器 34
5。3 本章小结 35
6 电路测试 37
6。1 带通滤波器的测试 AD603的30MHz中频放大器设计与应用:http://www.youerw.com/tongxin/lunwen_93376.html