射频AB类功率放大器电路设计

射频AB类功率放大器电路设计(任务书,开题报告,外文翻译,论文15000字)
摘 要
无线通信系统广泛应用于现代社会日常生活,而射频功率放大器作为无线通信系统的核心部分,能够在高频段对信号进行稳定放大。由于射频功率放大器相较于传统放大器具有明显优点且在无线通信系统中具有重要地位,因此目前对于功率放大器的研究和应用已经相当成熟,如何改善放大器的输出线性度和效率更是设计师关心的重点,所以对本课题进行研究具有重要意义。
本设计基于阻抗匹配网络理论和负载牵引技术,根据设计指标要求,利用ADS软件对射频微波电路进行仿真设计,完成窄带驱动级射频AB类功率放大器的实体电路搭建工作,并对其实际性能进行了测量与分析。
通过对设计的电路优化调谐,所设计的功率放大器的仿真电路给出的仿真结果符合设计要求,能够在1850MHz频率下稳定工作并能产生4W的输出功率,工作效率达到40%以上。但是最终加工出来的PCB板的输入和输出端大小不一致,导致实际测量时谐振点出现偏移,测量结果不理想。
本课题主要是完成了窄带驱动级放大器电路设计。该放大器电路结构紧凑,尺寸小,节约了制造成本,而且能够在较高频段对输入信号进行线性放大。 [资料来源:http://www.doc163.com]
关键词:射频功率放大器;负载牵引;ADS软件
Abstract
The wireless communication systems are widely used in modern social life, as the central part of wireless communication system, Radio frequency power amplifier can stably amplify the signal in the high frequency band. Compared with the traditional amplifier, the radio frequency power amplifier has obvious advantages. Considering its important position in the wireless communication system, at present, the research and application of power amplifier has been quite mature. Designers are more concerned with the focus on how to improve the linearity and efficiency of the amplifier output. So the research of this topic has important significance.
According to the design requirements, this design is based on the impedance matching network theory and the load pull technology and carry on the simulation design to the radio frequency microwave circuit by Using ADS software. What’s more, it completes the welding work of the physical circuit of the narrow band driven class AB power amplifier. In the end, the measurement and analysis of its actual performance are carried out.
By optimizing the design of the circuit., the simulation results of the designed power amplifier can meet the design requirements. The amplifier can work stably at the frequency of 1850MHz and generate the output power of 4W, The work efficiency is above 40%. But the input and output of the PCB board is not in the same size, which leads to the offset of the resonant point in the actual measurement, and the result is not ideal.
The main task of this paper is to complete the design of narrow band driver amplifier, the circuit is compact, the size is small, and the manufacturing cost is saved,The input signal can be amplified linearly in the higher frequency band.
Key words: Radio frequency power amplifier; Load pull; ADS software
[资料来源:http://Doc163.com]


目 录
摘 要 I
Abstract II
第1章 绪论 1
1.1 研究背景及意义 1
1.2 国内外研究现状及发展趋势 1
1.3 论文结构及安排 2
第2章 射频放大电路理论基础 3
2.1 功率放大器设计技术简介 3
2.1.1 负反馈技术 3
2.1.2 负载牵引技术 4
2.1.3 双端口网络 4
2.1.4 阻抗匹配理论 5
2.2 本章小结 6
第3章 功率放大器基本指标和分类 7
3.1 功率放大器的基本指标和原理 7
3.1.1 工作频带 7
3.1.2 增益和增益平坦度 7
3.1.3效率 7
3.1.4 1dB压缩点 7
3.1.5 三阶交调系数 8
3.2 传统功率放大器的分类和分析 8
3.3本章小结 9
第4章 射频AB类功率放大器的研制 10
4.1 AB类功率放大器的仿真 10
4.1.1 晶体管的选择 10
4.1.2 静态工作点的选取 10
4.1.3稳定性分析 12
4.1.4负载牵引和源牵引 13
4.1.5输出匹配电路建立 16
4.1.6输出偏置电路设计 19
4.1.7输出匹配带偏置设计 20
4.1.8输入匹配带偏置电路建立 21
4.1.9 S参数仿真 23 [版权所有:http://DOC163.com]
4.1.10 HB仿真 24
4.2 AB类功率放大器的版图设计与仿真 27
4.2.1版图生成 27
4.2.2版图联合原理图仿真 28
4.2.3联合单音非线性仿真 29
4.2.4联合双音谐波仿真 30
4.2.5输出CAD图纸 31
4.3本章小结 32
第5章 实际电路板焊接与调试 33
5.1 实际电路板焊接 33
5.2 数据测量及分析 33
5.3 本章小结 35
第6章 总结与展望 36
参考文献 37
致 谢 38 [资料来源:http://Doc163.com]
