高输入阻抗放大器设计报告.doc

课程设计任务书
学生姓名: 专业班级: 电信0902
指导教师: 刘运苟 工作单位: 信息工程学院
题 目： 高输入阻抗放大器设计
初始条件：
具备模拟电子电路的理论知识；具备模拟电路基本电路的设计能力；具备模拟电路的基本调试手段；自选相关电子器件；可以使用实验室仪器调试。
要求完成的主要任务：（包括课程设计工作量及其技术要求，以及说明书撰写等具体要求）
1、输入电压和输出电压函数关系为：
2、输入信号频率不大于100HZ
3、在室温下，若信号源内阻在100KΩ至1MΩ变化时，信号源开路电压为50mv～100mv时，放大器误差不大于1％
4、要求共模抑制比≥60dB
5、设计电源；
6、焊接：采用实验板完成，不得使用面包板。
4、安装调试并完成符合学校要求的设计说明书
时间安排：
十八周一周，其中3天硬件设计，2天硬件调试
指导教师签名： 年 月 日
系主任（或责任教师）签名： 年 月 日
目录
摘要 ·······································································I
1 原理与器件的选择··························································1
LM7815、LM7915的简介··················································1
OP07CP集成芯片的介绍··················································2
2 工作原理及原理图··························································3
框图··································································3
直流电源的电路图及原理················································3
高输入阻抗差动放大器的电路图及原理····································5
3 Protues仿真与结果分析·····················································7
····························································7
······························································7
4 电路焊接··································································8
5 心得体会··································································9
6 致谢·····································································10
参考文献···································································11
摘要
要实现高输入阻抗一个重要的任务就是要能够抑制零点漂移，另一个重要的任务就是能够放大偏差信号。抑制零点漂移的可以采用下面几种方法：（1）利用直流负反馈，稳定电路的静态工作点。（2）采用温度特性较好的高性能器件。（3）采用温度补偿法，利用热敏器件的参数随温度变化而变化的特性，抵消电路随温度变化而变化的影响。采用差分放大电路，利用特性相同的对管，使它们的温度漂移互相抵消。
本实验是以集成芯片OP07C设计的高输入阻抗放大电路。为了提高输入阻抗，电路采用同相输入端加信号电压的方法，同时为了保证两个信号源都加到运放的同相输入端，采用两个同相放大电路组成第一级放大。电路结构对称，除了具有高输入阻抗外，还具有很高的共模抑制比性能，第二级为差动放大电路。该电路可用于信号源有公共地端和不接地