X波段低噪声放大器的优化设计

发布时间：2018-01-11 20:20

本文关键词：X波段低噪声放大器的优化设计　出处：《燕山大学》2016年硕士论文　论文类型：学位论文

【摘要】：低噪声放大器是微波接收系统中较为重要的部件之一,处在系统的前端,主要功能是把接到的信号线性放大,并抑制其中的噪声。它的性能优劣会直接决定着整个接收系统的灵敏度以及噪声性能。随着现代卫星通讯、雷达、导航术的迅猛发展,性能更佳、实用性更强的低噪放研发受到了越来越广泛的关注。论文主要内容如下:首先,对低噪声放大器的研究背景、意义及现状进行简要介绍,并对设计中所使用的微带相关理论进行详细概括。通过微波传输线的简述,引出微带线的特性及参数计算等内容,并分析了带有微带线结构的匹配电路的设计。其次,对微波网络进行了简要的概述,对二端口网络、S参数和史密斯圆图的概念进行了解释。接着介绍了低噪放设计中涉及的性能指标,主要通过围绕噪声、稳定性、增益、驻波比的概念及意义进行详细的分析和阐述。最后,运用射频设计工具ADS2013,结合低噪放的偏置电路和稳定性,采用源极串联负反馈方法,选取AVAGO公司的晶体管VMMK-1218,使用微带线匹配电路以及两级级联结构。通过仿真,低噪放在8.7~9.3GHz频段范围内噪声系数小于0.2dB,增益大于26dB,驻波比均小于1.4,性能良好,满足了设计指标的需求。
[Abstract]:Low noise amplifier (LNA) is one of the most important components in microwave receiving system. It is in the front end of the system, and its main function is to amplify the received signal linearly. And suppress the noise. Its performance will directly determine the sensitivity and noise performance of the whole receiving system. With the rapid development of modern satellite communications, radar, navigation technology, the performance is better. More and more practical low noise amplifier research and development has been paid more and more attention. The main contents of this paper are as follows: first of all, the research background, significance and current situation of low noise amplifier are briefly introduced. The related theories of microstrip used in the design are summarized in detail. Through the brief introduction of microwave transmission line, the characteristics and parameter calculation of microstrip line are introduced. The design of matching circuit with microstrip line structure is analyzed. Secondly, the microwave network is briefly summarized, and the two-port network is given. S parameters and the concept of Smith circle diagram are explained. Then the performance indexes involved in the design of low noise amplifier are introduced, mainly by surrounding noise, stability and gain. The concept and significance of VSWR are analyzed and expounded in detail. Finally, using RF design tool ADS2013, combined with the bias circuit and stability of low noise amplifier, the source pole series negative feedback method is adopted. Selected AVAGO transistor VMMK-1218, using microstrip line matching circuit and two-stage cascade structure. Through simulation. The noise coefficient is less than 0.2 dB, the gain is more than 26 dB and the standing wave ratio is less than 1.4 in the frequency range of 8.7 ~ 9.3GHz.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN722.3

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