基于ADS的接收机系统仿真分析
本文一开始对比分析了几种接收机的结构和工作原理，并且给出了影响接收机性能的指标，例如系统增益等。在对各种元器件性能指标进行了详细的了解和分析后，利用ADS微波仿真软件对设计的接收机进行了仿真测试，从最后结果来看，基本满足要求。
关键词 零中频 接收机 系统增益 ADS
毕业论文设计说明书外文摘要
Title the analysis and simulation of receiver based on ADS
Abstract
In recent decades,wireless technology with mobile communication applications as the leading, have developed quickly and gained tremendous success.RF front-end as their whole indispensable component part of the system, directly impact on the performance of the system.The zero intermediate frequency receiver selected as the model in the thesis,it involved the RF front-end, the down-conversion structure and the analog base-band circuit.
From the start of the paper,the structural features and the working principle of several common receivers were contrasted and analysed, and the technical parameters of influencing receivers also was introduced, such as the system gain.After the detailed comprehension and analysis of the components,and then it was optimized and simulated by using ADS (Advanced Design System). According to the results of simulation, the design met the requirements.
Keywords The zero-intermediate-frequency receiver system gain ADS
目 次
1 引言 1
1.1 接收机的发展现状 1
1.2 课题意义与背景 2
1.3 论文的研究内容和章节安排 2
2 接收机基本原理 4
2.1 接收机基本类型 4
2.2 接收机的主要技术指标 8
2.3 接收系统各部分特点 10
2.4 本章小结 11
3 零中频接收机系统设计 12
3.1 射频前端电路 12
3.2 下变频电路 13
3.3 模拟基带电路 14
3.4 总电路图 15
3.5 本章小结 16
4 仿真结果 17
4.1 接收机频带选择性仿真 17
4.2 接收机信道选择性仿真 19
4.3 接收机系统链路预算仿真 21
4.4 接收机下变频仿真 24
4.5 本章小结 25
结 论 26
致 谢 27
参考文献28
1 引言
射频(Radio Frequency)是指在无线电通信中所使用到的电磁波频率，包括高频(High Frequency)、甚高频(Very High Frequency)、超高频(Ultra High Frequency)和更高频率的频段。当电磁波处于高频率状态，便能在空气中传播，并且可以由电离层反射形成远距离传播，这种具备远距离传播能力的电磁波就是射频。射频电路与一般普通电路不同，其环境是在高频之下，电容电感对电路的影响很大。而杂散参数对电路的影响也随着频率的增加而增大。
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