课程设计任务书
学生姓名： 专业班级： 指导教师： 工作单位： 题 目: 高频功率放大器设计 初始条件：
1、可选元件：晶体管、高频磁环、电阻、电容、开关等 2、仿真软件：Mulitisim
要求完成的主要任务:
设计一个高频功率放大器，要求 1. 输出功率Po≥125mW 2. 工作中心频率fo=6MHz 3. ?>65%
时间安排：
1．理论讲解，老师布置课程设计题目，学生根据选题开始查找资料； 2．课程设计时间为1周。
（1）确定技术方案、电路，并进行分析计算， 时间1天；
（2）选择元器件、安装与调试，或仿真设计与分析，时间2天； （3）总结结果，写出课程设计报告，时间2天。
指导教师签名： 2010年 月 日
系主任（或责任教师）签名： 年 月 日
目录
摘要 .......................................................................................................................................................... I ABSTRACT ........................................................................................................................................... II 1 谐振功率放大器的工作原理 .............................................................................................................. 1 1.1 基本原理电路 .............................................................................................................................. 1 1.2 高频谐振功率放大器的电路组成................................................................................................ 3 1.3集电极电流余弦脉冲分解 ............................................................................................................ 3 1.4高频谐振功率放大器的性能分析 ................................................................................................ 6 1.4.1 谐振功率放大器的动态特性 ................................................................................................ 6 1.4.2 谐振功率放大器的负载特性 ................................................................................................ 7 1.4.3 放大器工作状态的调整 ........................................................................................................ 9 2 具体设计过程 ...................................................................................................................................... 9 2.1电路元件参数计算 ...................................................................................................................... 10 2.1.1基极偏置电路计算 ............................................................................................................... 10 2.1.2计算谐振回路与耦合线圈的参数 ....................................................................................... 11 2.1.3电源去耦滤波元件选择 ....................................................................................................... 11 2.2 谐振功率放大器的功率和效率关系协调 .................................................................................. 11 3高频谐振功率放大器电路仿真及结果分析 ..................................................................................... 13 3.1仿真结果 ...................................................................................................................................... 13 3.1.1第一放大级并测量所需参数和输出波形 ........................................................................... 13 3.1.2第二放大级并测量所需参数和输出波形 ........................................................................... 13 3.1.3第三放大级并测量所需参数和输出波形 ........................................................................... 14 3.2仿真结果分析 .............................................................................................................................. 15 总结 ........................................................................................................................................................ 16 参考文献 ................................................................................................................................................ 17 附录 ........................................................................................................................................................ 18
《通信电子线路》课程设计
摘要
通信电路中，为了弥补信号在无线传输过程中的衰耗要求发射机具有较大的功率输出，通信距离越远，要求输出功率越大。为获得足够大的高频输出功率，必须采用高频功率放大器。我们对高频功率放大器和低频功率放大器的共同要求是输出功率大和效率高，但由于两者的工作频率和相对带宽相差颇大，就决定了他们之间有根本的差异。基于两种放大器的不同特点，使得这两种功率放大器所选的状态有所不同：低频功放工作于甲类、甲乙类或乙类（限于推挽电路）状态，现在也出现了一些工作于丁类的低频放大器；高频功率放大器则一般工作于丙类（某些特殊情况可工作于甲类、乙类、丁类、戊类等）。
高频放大器的主要技术指标是输出功率、效率、功率增益、带宽和谐波抑制等。这几项指标往往是相互矛盾的，在设计功率放大器时，总是根据该放大器的工作特点，突出其中一些指标，然后兼顾另外一些指标。
I
《通信电子线路》课程设计
Abstract
In communication circuits, in order to compensate for signal transmission in the wireless transmitter in the attenuation requirements have greater power output, communication, the greater the distance the greater the required output power. In order to obtain a large enough high-frequency output power, high-frequency power amplifier must be used. Our high-frequency power amplifier and low-frequency power amplifier output power of the common requirement is large and high efficiency, but because of the work of both frequency and relative bandwidth vary considerably, we decided there is a fundamental difference between them. Based on two different characteristics of the amplifier, making the status of these two different from the selected power amplifier: low-frequency power amplifier works in Category A, and B or Class B (limited to push-pull circuit) state, and now there have been some work on the small Class of low-frequency amplifiers; high-frequency power amplifiers are generally working in a Class C (in some special cases can work on the A, B, D, E, etc.).
The main technical indicators of high-frequency amplifier is the output power, efficiency, power gain, bandwidth and harmonic suppression and so on. The above targets, often contradictory, and in the design of power amplifiers, it always work according to the amplifier characteristics, highlighting some of the indicators, and then take into account some other indicators.
II