调频接收机课程设计.doc

《高频电子线路》课程设计说明书调频接受机设计院部：电气与信息工程学院学生姓名：谢曾闻达、刘泽仁、姚一鸣指导教师：刘海波专业：通信工程班级：通信1102班学号：完毕时间：2023年12月摘要信息传递是人类社会生活的重要内容，没有通信，人类社会是不可想象的，从古到今的烽火到近代的旗语，都是人们寻找快速远距离的通信手段。今年来，电子工业发展非常惊人，当然这些进步都成了人类生活不可缺少的东西，1937年莫尔斯发明的有线电报开创了运用电传递信息的新时代，1876年贝尔发明的电话已经成为我们平常生活中通信的重要工具，192023，调幅无线广播、超外差接受机问世，1936年，商业电视广播开播······随着着人类的文明、社会的进步和科学技术的发展，电信技术也是一日千里的速度飞速发展。然而无线通信在现在的生活中更是重要，小到我们常用的手机和各种电器的遥控器等，大到航天科技都离不开发射和接受设备。本次设计中，其目的是得到一个调频接受机。在接受机的设计过程中，应将其分为选频网络、高频放大、变频、解调、低放和低频功放六个部分。整个电路的设计必须注意几个方面，选择性好的级，应尽也许靠近前面，由于在干扰都不大的地方把干扰克制下去，效果最佳。如干扰信号很大，则由于三极管的非线性，将产生严重的组合频率及其他非线性失真，这时滤除杂波比较困难。因此，在高级接受机中，输入电路常采用复杂的高级选择电路。为了使混频和本振分别调在最佳状态，采用单独的本振。总得来说，设计一部接受机时必须全面考虑，妥善解决一些互相牵制的矛盾，特别要抓住重要矛盾（稳定性、选择性、失真等），才干使得接受机有较好的指标。关键词：调频、本振、混频、鉴频目录第1章调频接受机简介··········································11.1调频接受的特点··········································11.2调频接受机的工作过程····································11.3调频原理················································11.4调频接受机的重要技术指标································21.4.1工作频域范围·······································21.4.2灵敏度·············································21.4.3中频选择性·········································31.4.4中频克制比·········································31.4.5音频响应···········································31.4.6额定输出功率·······································3设计方案················································4各级电路设计············································53.1输入调频电路············································53.2高频放大电路············································53.3本地振荡电路············································63.4混频电路················································83.5二次混频电路············································103.6鉴频电路················································113.7低频放大电路············································13性能特点················································15结束语···························································16致谢·····························································17参考文献··············································