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根据低噪声放大器（LNA）的性能指标要求,首先介绍了LNA结构选取,再从器件和介质板的选择,输入输出匹配,稳定性和偏置电路等方面介绍了LNA的设计,并且利用微波仿真软件Serenade8．7对LNA电路进行了仿真和优化设计,给出仿真结果。最后给出的实际测试结果表明,该LNA能够满足指标要求。 相似文献
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3GHz～5GHz超宽带噪声系数稳定的低噪声放大器 总被引：1，自引：2，他引：1
采用共源共栅级结构和源极负反馈电路设计了一款应用于超宽带系统的低噪声放大器电路。结合巴特沃斯滤波器的特性,实现放大器的输入、输出匹配网络,并详细分析了电路的噪声系数。基于TSMC 0.18μm CMOS工艺,在3 GHz～5 GHz频带范围内对电路进行ADS软件仿真。仿真结果表明,在1.8 V供电电压下,功耗为13.2 mW,最大增益达到15 dB且增益平坦,最大噪声系数仅为1.647 dB,输入反射系数S11<-10 dB,输出反射系数S22<-14 dB。 相似文献
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本文设计实现了一个2～5GHz的两级CMOS低噪声放大器(LNA),可应用在超宽带的下半频段(3.1～5GHz)。LNA由两级组成,第一级是一个共栅级,保持良好的线性度并完成较好的输入匹配;第二级是一个共源级堆叠一个电流源,在保持低噪声系数的同时降低功耗。通过级联共栅和共源结构进行增益补偿,所设计的LNA具有近似恒定的增益和噪声系数。采用0.18μm CMOS工艺实现后,模拟结果表明,增益和噪声系数在2～5GHz频率范围内分别为11.5dB和5.1dB,输入反射系数低于-22dB。在4GHz时,模拟得到的三阶交调点为-10dBm。在1.8V电源电压下,LNA的功耗约为11mW。 相似文献
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基于0.18μm CMOS工艺,设计了一个新型的低噪声放大器。在该放大器中,采用带有级间匹配的共源共栅结构。采用级间匹配结构实现了低功耗高增益。为了降低芯片面积,使用LC并联网络代替传统的大电感。仿真结果表明,在5.8 GHz的工作频率下,功率增益大约为10.3 dB,而反向隔离度低于－16 dB。同时具有比较好的输入输出匹配。除此之外,还获得了比较小的最小噪声系数和比较好的线性度。在1.5 V的供电电压下,电路的静态功耗为12.7 mW。 相似文献
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宽带低噪声放大器的设计 总被引：1，自引：0，他引：1
探讨了使用S参数设计低噪声放大器(LNA)的方法。设计采用了PHEMT晶体管(ATF-35143)。设计过程首先从等效集总元件电路模型设计入手,然后对如何提高电路稳定性,降低噪声系数等方面进行了探讨,最后给出了工作带宽为1650M~2350M,增益G>29dB,增益平坦度GF±1dB,噪声系数NF<0.8dB的两级低噪声放大器的电路仿真结果。 相似文献
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A comparative study on recent works on low noise amplifiers (LNAs) designed to be operated at mobile communication band is performed in this article. Here, specifications of different generations of mobile communication are listed, which are considered to classify recent works on LNAs. Even though gain and noise figure (NF) are the primary parameters of LNA; other parameters like power, linearity, bandwidth, and area also get importance. Due to this, optimization techniques handpicked for all those parameters are discussed. The inverse relation between gain and NF is exploited to achieve low noise and high gain together. While increasing the gain, power consumption is increased by drain current. Each LNA is found as good in terms of gain and other parameters to satisfy the requirements. The figure of merit is opted to find the performance of each LNA, and the comparison is performed. The best parameters reported in the comparison are 31.53 dB of gain, 0.7 dB of NF, 0.03 mw of power consumption, 18.14 dBm of third‐order input intercept point (IIP3), 24 GHz bandwidth and 0.0052 mm2 of area at different frequencies and technology nodes. In this survey, as per the optimized FoM for mobile communication, cross‐coupled common gate differential LNA, which was designed to be operated at 0.3 to 2.96 GHz gives better results among CMOS LNAs. 相似文献
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变频设备噪声系数测量方法分析 总被引：1，自引：0，他引：1
针对变频设备噪声系数测量中的复杂性高和准确度差的问题,阐述了采用增益法和噪声系数分析仪测试变频系统噪声系数的基本原理,指出了2种测试方法中容易产生测试误差的操作步骤及相应的操作要点,分析了噪声系数分析仪变频模式下非零校准产生的原因及其对最终测试结果的影响,比较了使用不同方法测试同一系统的测试结果,解释了测试结果差异产生的原因,说明了2种测试方法的适用范围和各自的局限性。 相似文献
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分析了贴片电容的非理想特性在C波段及以上频率的自偏置电路旁路应用中对低噪放设计的不利影响.分析表明,贴片电容用做自偏置旁路时将严重恶化电路的稳定性和噪声指标.提出了对自偏置电路的改进方法及工艺实现,从而避免了电容对指标的负面影响.为了验证改进电路的优势,采用改进的自偏置电路设计了6 GHz～9 GHz低噪放,实验结果很... 相似文献
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GAO Ting ZHOU Feng LI Wei LAN Fei LI Ning & REN JunYan State Key Laboratory of ASIC & System Fudan University Shanghai China Micro-/Nano-Electronics Science Technology Innovation Platform 《中国科学:信息科学(英文版)》2011,(2)
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Q. García-García 《国际射频与微波计算机辅助工程杂志》2004,14(2):99-110
This article addresses the noise behaviour (noise temperature and noise figure) of some passive microwave multiport circuits. The analysis method is based on the noise-wave formulation. With the exception of the attenuator case, which is used as a reference, the circuit elements considered are lossless devices, in the sense that neither conductive nor dielectric losses are accounted for. The analysis shows that, when connected to matched loads in some of their ports, these multiports circuits lose their lossless nature and their scattering matrix is not unitary; therefore, they generate thermal noise. The article addresses and formalizes mathematically the noise properties of a number of lossless microwave devices such as N-port power splitters, circulators, and hybrid couplers. While the noise-wave mathematical formulation may be cumbersome in some cases, all the devices and configurations analyzed in this work have been characterized in terms of noise figure and noise temperature, which is a much more practical approach in most situations. Some implications of the use of these devices and configurations in antenna arrays for antenna noise temperature evaluations have been also addressed. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 14, 99–110, 2004. 相似文献
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This article investigates techniques to design noise‐matching networks for a class of multimodal antennas, specifically, the so‐called quad‐mode antenna. Such an antenna utilizes weighted combinations of four very dissimilar radiation patterns, and different modal input impedances, which vary across scan angle. The matching problem is therefore quite different from that of a classical array, where antenna elements are normally assumed to be similar. In addition to the standard techniques, a new, recursively averaged active impedance, is proposed and applied, as well one using a noise‐active impedance, and two optimization approaches. It is shown for the first time that the quad‐mode antenna displays excellent noise properties, with the simplest technique, namely that of matching to the self‐impedances, producing noise performances across all scan angles which are almost as good as the best solution found by all the techniques. 相似文献
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针对非平行微带线间的串扰问题,研究了防护线对抑制非平行微带线间串扰的效果,提出了根据非平行微带线间边缘场的主要耦合区域应用防护线的方法;理论分析与仿真结果表明,与铺设同干扰线等长的防护线相比,采用在非平行微带线间边缘场的主要耦合区域使用防护线的方法可以在起到同等抑制串扰效果的情况下,节约一部分防护线及其相应的接地过孔;该方法提高了应用防护线的效率,有助于预留出更多的可用布线空间,同时也有利于降低印制电路板生产成本。 相似文献
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利用线性化补偿技术设计了一个位于接收前端T/R组件中的高线性低噪声放大器,通过在常用共源共栅电路中加入线性辅助电路实现。该电路在其他指标基本不变的情况下,线性度提高约15 dB。采用CMOS 0.18μm工艺设计该电路。 相似文献
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CAO XueMing ZU DongLin ZHAO XuNa FAN Yang & GAO JiaHong Beijing Key Laboratory of Medical Physics Engineering IHIP of Physics School Peking University Beijing China 《中国科学:信息科学(英文版)》2011,(7)
In this paper, a low-noise preamplifier for MRI is designed and studied. A noise matching network consisting of three elements is presented. To the single-stage AsGa-FET preamplifier working at 128 MHz, the measured gain through network analyzer (HP8712C) and noise figure through noise figure analyzer (8970B) are 25 and 0.43 dB, respectively. 相似文献