高输入阻抗放大器设计方案报告.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100HZ3、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≥60dB5、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·······································································I1原理与器件的选择··························································、LM7915的简介····································································································22工作原理及原理图················································································································································································································53Protues仿真与结果分析···············································································································································································74电路焊接··································································85心得体会··································································96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两种情况。直流电压源采用的是LM7815、LM7915,型号的集成稳压芯片组成的具有同时输出的+15V、-15V电压的稳压电路。并用PROTUES仿真软件对实验电路进行仿真。关键字:OP07C;LM7815;LM7915;高输入阻抗;、+15V,。LM7915输出为-15V,。三端集成稳压器LM7815、LM7915引