共查询到19条相似文献,搜索用时 93 毫秒
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基于低噪声放大器设计原理,从噪声、线性度、阻抗匹配等方面详细讨论了低噪声放大器的设计。电路采用TSMC 0.18μm CMOS工艺进行设计,利用ADS2005A对电路进行谐波平衡、S参数分析及双音测试,结果表明,其噪声系数为1.795dB,正向增益为17.35dB,IIP3约为-1.43dBm,功耗约8.96mW。 相似文献
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一种低噪声放大器的自适应阻抗匹配网络模型的设计 总被引:1,自引:0,他引:1
为了解决微弱信号检测过程中的输入噪声匹配问题,文章根据低噪声放大器的噪声匹配特点设计了一种自适应阻抗匹配网络模型;该模型通过实时测算信号源阻抗和低噪声放大器最佳源阻抗的变化自动调整匹配网络的相关参数,从而达到输入阻抗匹配的目的;仿真实验结果表明,此模型在一定程度上能较为准确地实现低噪声放大器的噪声匹配,稳定性较好,解决了微弱信号检测中因源阻抗的变化引起的放大器噪声系数恶化、检测灵敏度下降等问题,具有一定的工程应用意义。 相似文献
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一种0.8GHz~6GHz CMOS超宽带低噪声放大器设计 总被引:1,自引:0,他引:1
给出了一个针对0.8GHz~6GHz 的超宽带低噪声放大器 UWB LNA(ultra-wideband low noiseamplifier)设计。设计采用0.18μm RF CMOS 工艺完成。在0.8GHz~6GHz 的频段内,放大器增益 S21达到了17.6dB~13.6dB。输入、输出均实现良好的阻抗匹配,S11、S22均低于-10dB。噪声系数(NF)为2.7dB~4.6dB。在1.8V 工作电压下放大器的直流功耗约为12mW。 相似文献
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对于晶体管(场效应管)的低噪声设计,目前采用的方法是根据器件内部参数来计算最佳源电阻,最佳工作电流及信号工作频率。这种方法很难用于集成运算放大器的低噪声设计。因为对于集成运算放大器,不仅无法准确提取器件内部参数及噪声參数,而且噪声电路的计算也极为复杂。因此,其噪声系数图(NF图)及最佳工作参数的设计只能依据对E_n(f)及I_n(f)的测试来解决。本文提出了用FFT分析仪及计算机组成的噪声测试系统,来测量E_n(f)及I_n(f)。并编制了相应的应用软件,实现了对低噪声运算放大器的NF图计算,从而得到了器件工作在最佳噪声性能时的源电阻及信号工作频率。本文给出了对LFC3集成运算放大器的低噪声设计结果。 相似文献
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一种新的ISM频段低噪声放大器设计方法 总被引:1,自引:1,他引:0
为解决ISM频段低噪声放大器降低失配与减小噪声之间的矛盾,提出了一种改善放大器性能的设计方法。分析了单项参数的变化规律,提出了提高综合性能的方法,给出了放大器封装模型的电路结构。对射频放大器SP模型和封装模型进行仿真。仿真结果表明,输入和输出匹配网络对放大器的性能有影响,所提出的设计方法能有效分配性能指标,为改善ISM频段低噪声放大器的性能提出了一种新的途径。 相似文献
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低噪声放大器作为移动通信、雷达、遥控遥感系统接收机前端信号处理的重要第一级,对整个接收系统的噪声性能指标的贡献起着举足轻重的作用。以微波低噪声放大器理论知识作为基础,通过ADS软件的仿真和验证,很好的解决了3dB耦合器和放大器的级间匹配的问题,成功设计出了3.5GHz低噪声放大器并达到了设计指标。 相似文献
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基于Ansoft Designer的射频功放电路阻抗匹配优化设计 总被引:1,自引:0,他引:1
针对工作频率为433MHz 的射频功率放大电路中的阻抗匹配问题,提出了基于 EDA 软件——Ansoft designer 的阻抗匹配优化设计方法。运用 Ansoft designer 对射频功放电路进行了阻抗匹配优化设计,并对电路进行了仿真分析。仿真结果表明射频功放电路的增益得到了明显的提高,反射系数得到了显著的改善,达到了阻抗匹配优化设计的目的。 相似文献
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是针对20 k~30 k频段的水声换能器设计D类功率放大器和匹配电路,PWM电路相对线性电路具有效率高、尺寸小等优点,所以D类功放一般选用PWM调制,D类功放由三角波发生器、比较器、功率管以及保护模块组成,实现高效率、低失真的功率放大。D类功放的输出一般都要通过一个低通滤波器来滤除高频信号,来还原低频信号。由于水声换能器是容性负载,会产生很大的无功功率,因此需要设计匹配电路,匹配包括调谐和阻抗匹配。匹配电路的加入能大大减少水声换能器的无功功率,进而提高功放的效率,使水声换能器在工作频段内能稳定工作。 相似文献
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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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Alessandro Salvucci Patrick E. Longhi Sergio Colangeli Walter Ciccognani Antonio Serino Ernesto Limiti 《国际射频与微波计算机辅助工程杂志》2019,29(9)
Low‐noise amplifier (LNA) designers often struggle to simultaneously satisfy gain, noise, stability, and I/O matching requirements. In this article, a novel design technique, tailored for two‐stage low‐noise amplifiers, is presented. The proposed design method is completely deterministic and exploits inductive source degeneration to obtain a two‐stage LNA featuring perfect input and output match together with low noise figure (NF) and a pre‐determined gain, including stability analysis. A novel flowchart is provided together with the corresponding design chart that contains gain, matching, and stability information, therefore addressing all key figures‐of‐merit of a linear amplifier. The design chart is easily implementable in commercial Electronic Design Automation software, to aid designers in the difficult task of selecting the appropriate source degeneration inductor value. The noise performance, on the other hand, is the best possible since the matching networks are designed to provide the input of the two Field Effect Transistors with the optimum termination for noise. The design method is validated with two separate test vehicles operating respectively at Ka‐band (26.5‐31.5 GHz) and K‐band (20.0‐24.0 GHz). The realized Monolithic Microwave Integrated Circuits exhibit 18 dB gain for both versions, NF of 1.5 and 1.2 dB, respectively for the Ka‐band and K‐band version. Input and output matching are typically better than 12 and 15 dB. 相似文献
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The real frequency technique (RFT) is an efficient numerical method to design the matching networks of microwave active circuits. It provides several advantages over most of the usual techniques. By directly including measured scattering and noise parameter data, it does not require any rational functions or circuit models. Moreover, a predetermined matching circuit topology is not necessary. The described method also allows the design of stability-guaranteed broadband circuits when employing potentially unstable transistors. With the Levenberg–Merquardt algorithm, the RFT can be applied to simultaneously optimize transducer power gain, input and output VSWRs, noise figure, and group delay of a multistage microwave active circuit. Applications as different as low-noise amplifier, active filter, or broadband amplifier are possible. © 1998 John Wiley & Sons, Inc. Int J RF and Microwave CAE 8: 131–141, 1998. 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