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1、 通信电子线路课程设计说明书简易调频发射机（话筒）系 、 部： 电气与信息工程系 学生姓名： 指导教师： 职称 讲师 专 业： 电子信息工程技术 班 级： 电信 0902 完成时间： 2011 年 6 月 5 日 1摘 要调频发射机作为一种简单的通信工具，由于它不需要中转站和地面交换机站支持，就可以进行有效的移动通信，因此深受人们的欢迎。目前它广泛的用于生产、保安、野外工程等领域的小范围移动通信工程中。本课题重点在于设计能给发射机电路提供稳定频率的振荡调制电路。课题首先用两级电压并联负反馈放大电路，适当放大语音信号，以配合调制级工作；然后用石英晶体构成振荡电路为发射机提供稳定的基准频率载波，接
2、着通过变容二极管完成语音信号对载波信号的频率调制，并通过 LC 并联谐振网络选出三倍频信号；最终利用两级功率放大，使已调制信号功率大大提高，经过串联滤波网络滤除高次谐波，最后通过拉杆天线发射出去。通过后续的电路仿真和部分电路的调试，可以证明本课题的电路基本成熟，基本能完成语音信号的电压放大、频率调制和功率放大，达到发射距离的要求。本课程设计结合 Multisim 软件来对简易调频发射机电路的设计与调试方法进行研究。Multisim 软件能实现从电学概念设计到输出物理生产数据，以及这之间的所有分析、验证、和设计数据管理。今天的 Multisim 软件已不是单纯的设计工具，而是一个系统 ，它覆盖了
3、以仿真为核心的全部物理设计。使用 Multisim、等计算机软件对产品进行辅助设计在很早以前就已经成为了一种趋势，这类软件的问世也极大地提高了设计人员在机械、电子等行业的产品设计质量与效率。本课题的设计目的是要求掌握最基本的简易调频发射机的设计与安装及对各级电路进行详细地探讨，并利用 Multisim 软件仿真设计一个简易调频发射机。关键字：LC 调频；射级跟随器；高频功率放大2ABSTRACTFM transmitter, as a kind of simple communication tools, because it does not require station and grou
4、nd switch stand support, can effectively mobile communications, so deeply the welcome of people. At present it widely used for production, security, field in the construction of small areas of the mobile communication engineering. This subject focuses design can give transmitter circuits provide sta
5、ble frequency oscillation modulation circuit. Topic firstly with two levels of voltage parallel negative feedback amplifying circuit appropriate amplification speech signal, to match the modulation level; Then use quartz crystal constitute oscillating circuit for transmitter provide stable benchmark
6、 frequency carrier, and then through the transfiguration diode speech signal to complete the carrier signal frequency modulation, and through the LC parallel resonant frequency signal network elected three times, Finally using two levels of power amplifier, make already modulation signal power great
7、ly improved, after series of the filtering network filter HHG, finally through bars antenna emitted. Through subsequent circuit simulation and part of the circuit, commissioning, can prove this topic circuit basic mature, basic can finish the speech signal voltage amplifier, frequency modulation and
8、 power amplifier, to launch the distance of the request. This course design with Multisim software to simple FM transmitter circuit design and debug method study. Multisim software can realize from the electrical concept design to the output physical production data, and that between all analysis, v
9、erify, and design data management. Todays Multisim software has not simple design tools, but a system by simulation, it covers all the physical design as the core. Use Multisim, computer software for products such as assistant design long before has become a trend, this kind of software release also
10、 greatly improve the design personnel in mechanical and electronic industries of product design quality and efficiency. This topic are designed requiring the most basic simple FM transmitter design and installation and for all levels and circuit detail discussion, and using Multisim software simulat
11、ing a simple FM transmitter. Key word: LC FM, Shoot level follow manometers; Rf power amplifier 3目 录1.课程设计任务41.1 引言 41.2 设计目的.41.3 设计任务.41.4 基本要求 4 2.总体方案.52. 1方案选择 .52. 2工作原理 .52. 3设计框图 .53系统硬件设计63.1 LC振荡电路的选择 63.2 谐振放大级选择 83.3 功放输出级 93.4 总电路原理图设计 114、电路性能测试与仿真图 125.1LC振荡电路仿真波形 125.2缓冲放大级仿真波形 125.3高频功率放大电路仿真 135误差分析及单元电路的测试156.1 误差分析156.2 单元电路测试164设计总结17致谢18参考资料191.课程设计任务书1.1 引言本文设计一个调频发射机，调频发射机由前级LC振荡电路，变容二极管调频，射级跟随器，甲放，和高频放大电路构成。高频放大电路是调频发射基末级电路，其性能的优劣直接影响到发射机的好坏，稳定性和放大特性等指标。因此本文设计对中频放大电路做了比较详细的介绍。1.2设计目的通过调频发射机电路的设计，使得建立无线电发射收机的整机概念，了解发射机整机各单元
