L波段双频宽带低噪声放大器的研究与设计

发布时间：2018-04-17 00:24

本文选题：低噪声放大器 + 匹配网络　；参考：《广东工业大学》2017年硕士论文

【摘要】：低噪声放大器是射频系统中重要的组成部分,它处于接收机的第一级,影响着整个系统的噪声和灵敏度。随着无线电技术的发展,射频接收端趋向小型化、高集成度和多频段的设计方向,这对低噪声放大器提出了更高的要求。在其基本理论和设计方法上,本文设计出了一个具有新型匹配结构的双频宽带低噪声放大器。通过回顾国内外低噪声放大器的研究发展状况和课题要求,本文设计了一款工作于频率1.2GHZ-1.25GHZ和1.556GHZ-1.608GHZ的三级宽带双频低噪声放大器,该放大器是采用Avago公司的ATF-54143晶体管和村田公司的电容电感搭建而成。在确定合适的静态工作点后,同时兼顾绝对稳定性和射频扼流的目的,设计了整个偏置电路。采用并联双通道结构的双频设计方法,两个低噪声放大器通过一个在全频段具有高隔离度和高匹配度的合路器进行功率合成。在匹配电路的设计上,基于短截线理论,采用了一个联合微带线和集总元件的匹配网络,其兼具集总元件和分布参数元件匹配网络的特性。通过仿真软件设计优化,并且进行了实物的测量,在经过两款放大器的调试工作后,两个端口实测S11均在-10d B以下,且增益大于30d B,增益平坦度小于1d B。仿真噪声系数在1d B以下,满足工程设计需求。这款低噪声放大器的成功设计,证实了基于短截线理论的联合匹配网络在多级低噪声放大器应用的可行性。运用在工作频率内具有高隔离度和高匹配度的合路器,能便于并联双通道中两个放大器独立工作,有效地增强其电路性能。整个低噪声放大器具有很好的市场前景。
[Abstract]:Low noise amplifier (LNA) is an important part of RF system. It is in the first stage of receiver and affects the noise and sensitivity of the whole system.With the development of radio technology, the RF receiver tends to be miniaturized, with high integration and multi-band design, which puts forward higher requirements for LNA.In terms of its basic theory and design method, this paper designs a novel matching structure of dual-frequency broadband low-noise amplifier.By reviewing the research and development of low noise amplifiers at home and abroad, this paper designs a three-stage broadband dual-frequency low-noise amplifiers working in frequency 1.2GHZ-1.25GHZ and 1.556GHZ-1.608GHZ.The amplifier is made of ATF-54143 transistor of Avago Company and capacitive inductance of Murata Company.After determining the suitable static working point and taking into account the absolute stability and the purpose of RF choke, the whole bias circuit is designed.Using the dual-frequency design method of parallel two-channel structure, two low-noise amplifiers are synthesized by a combiner with high isolation and high matching degree in the full frequency band.In the design of matching circuit, based on truncation theory, a matching network of microstrip line and lumped element is adopted, which has the characteristics of lumped element and distributed parameter element matching network.After the debugging of two amplifiers, the measured S11 of the two ports is below -10 dB, the gain is more than 30 dB, and the gain flatness is less than 1 dB.The simulation noise coefficient is below 1dB, which meets the requirement of engineering design.The successful design of this low noise amplifier verifies the feasibility of the application of the joint matching network based on the truncation theory in the multistage low noise amplifier.The combiner with high isolation and high matching in the working frequency can facilitate the two amplifiers to work independently in parallel two channels, and effectively enhance the circuit performance of the combiner.The whole low noise amplifier has a good market prospect.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN722.3

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