程控增益射频放大器设计--毕业设计论文.doc

摘要 随着半导体工艺技术的快速发展，射频电路器件的设计已逐渐形成无线通信发展的一个新潮流，也成为射频全芯片集成电路方面一个新的研究热点。低噪声放大器（Low Noise Amplifiers, LNA），就是用于便携式通信、蓝牙系统、卫星通信系统、相阵雷达系统等无线通信设备接收系统中的关键器件之一，其噪声、功率增益、信号带宽以及动态范围等性能直接影响着整个射频接收系统。因此，进行LNA设计技术的研究和积极探索对于射频集成电路设计和高性能、低成本的无线产品开发都具有很重要的意义。 根据目前射频通信电路的发展状态和趋势，本文主要进行了接收机的射频前端可增益低噪声放大器的研究和设计。以此为导向，开展了LNA相关知识资料的搜集、分析和拓扑结构与版图的设计、优化以及芯片测试研究等工作。并根据电路结构提出了参数优化方案，取得了比较满意的设计效果，最终设计出了性能指标较好的低噪声放大器。 关键词：射频通信电路，低噪声放大器，可变增益放大器。 ABSTRACT As the semiconductor process develops rapidly, it gradually becomes a new trend in development of Radio frequency circuit components design, and it becomes to be a new research region and hotspot in RF whole wafer IC design. LNAs are one of the key components in wireless communication equipments, such as portable communic ation, blue-tooth system, satellite communication system, phase array radar system etc. Its performances such as noise figure, power gain, signal bandwidth and SFDR will directly have an effect on the whole RF system. So it has important significance to do profound research and exp loiture of LNA for RFIC(Radio Frequency Integrated Circuit) design and low cost, high performace wireless products. According to present radio communication electric circuits development condition and tendency, This article has mainly conducted receivers low noise amplifier research and the design.low noise amplifiers noise performance, circuit topology design, circuit layout design, performance optimization and the test techniques of device are deeply researched and made a more systematic analysis and study in the paper, the parameter optimization methods also are demonstrated, which got the satisfying results. At last, a better performance, well worked LNA in all kind of technical specifics is designed. Key works : radio communication electric circuit, low noise amplifiers, variable gain amplifier目录 第一章 绪论 - 1 - 1.1 通信系统的组成 - 1 - 1.2 移动通信的射频设计 - 2 - 1.3 射频设计在移动通信机设计中的重要地位 - 3 - 第二章 低噪声放大器的基本理论 - 4 - 2.1 射频小信号放大器电路的主要技术指标 - 4 - 2.1.1 增益 - 4 - 2.1