发射机要求毕业设计论文.doc

(此文档为word格式，下载后您可任意编辑修改！) 优秀论文 归档资料 未经允许 切勿外传 摘 要 近年来随着无线通信的迅速发展，现代通讯系统对发射机的要求越来越高，射频功率放大器作为无线发系统中的最后一级，它在整个系统中占有十分重要的地位射频功率放大器由于尺寸小、线性度高、噪声低等优点，广泛应用在卫星通信、移动通信、。2.4GHz~2.5GHz工作频带和70~100毫瓦输出功率的放大器，它可以应用于微波射频识别系统和无线通信系统，以及物联网节点上。现在市面上有许多这样的产品，比如有无线路由器、无线网卡、无线遥控器、蓝牙耳机、智能家电、智能标签、针孔摄像机等等，为此我设计了一种应用于蓝牙耳机的发射机末端的功率放大器。 本文从偏置电路、噪声优化、线性增益及输入阻抗匹配等角度分析了电路的设计方法，借助 ADS 仿真软件的强大功能对晶体管进行建模仿真，在这个基础上对晶体管的稳定性进行了分析，结合 Smith 圆图，对输入输出阻抗匹配电路进行了仿真优化设计，设计了一个中心频率为、带宽为、输入输出驻波比小于、和增益的放大器。 射频功率仿真ABSTRACT In recent years, with the rapid development of wireless communication, modern communication system of the transmitter to demand more and more, the RF Power Amplifier as a wireless in the final launch system level, it occupies very important position in the system, because its the output power decided the communication coverage, its efficiency decided to the battery consumption level and use time, so the design performance index of the good RF Power Amplifier satellite communication, mobile communications, the wireless local area network. And out of my 2.4 GHz ~ 2.5 GHz band and work 70 ~ 100 mw of power output of amplifier, it can be used in the microwave radio frequency identification system and wireless communication system, and content networking nodes. Now there are many such products, such as a wireless router, wireless network card, wireless remote control, bluetooth , for this reason I design a bluetooth the end of the power amplifier. This paper, from the offset circuit, noise optimization, linear gain and input impedance matching angles such as the design method of the circuit analysis, with ADS simulation software of the powerful features of the transistor modeling simulation, and on this basis to the stability of the transistor is analyzed, combined with Smith circle diagram, the inputoutput impedance matching circuit simulation optimization design, design of a center for 2.45 GHz frequency, and bandwidth for 100 MHz, inputoutput ratio is less than 1.5, standing