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利用动态偏置方法扩展LNA动态范围的理论分析及实现 被引量：1

Study and realization of adjustable bias for enlarging LNA dynamic range
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摘要 本文提出了一种扩展LNA动态范围的方法——动态偏置,即根据接收信号的强弱动态地调节低噪声放大器(LNA)的偏置。文中从理论上阐述了此方法的有效性,并介绍了方法实现中所用到的三项关键技术,分别为:利用镜像电流源提供动态偏置电流,合理地设计匹配电路,利用自定义的优选函数选取恰当的偏置电流范围。实测结果表明,动态偏置LNA的噪声系数为1.46dB,输入三阶互调截止点(IIP3)为20.38dBm,无杂散动态范围达到99.29dB,相对于传统固定偏置的LNA,其动态范围提高了7.97dB,从而验证了动态偏置方法扩展LNA动态范围的有效性。 The method of adjustable bias which means adjusting the bias of LNA （Low Noise Amplifier） according to the amplitude of the receiving signal is one of the effective approaches for enlarging LNA＇s dynamic range. This method is analyzed theoretically, and three technologies are adopted in realization of this method, including： applying current mirror to provide the bias current, designing matching circuit properly and employing a selection algorithm to choose the range of the bias carefully. According to the measurement results, the designed LNA has an excellent performance： the noise figure is 1.46dB, and IIP3 is 20.38dBm. The dynamic range of this LNA achieves 99.29dB, which is 7.97dB higher than that of traditional one. It is verified that method of adjustable bias is suitable for enlarging LNA＇s dynamic range.
作者 李琨 滕建辅 黄建尧 刘玉华
机构地区 天津大学电子信息工程学院 天津理工大学电子信息工程学院
出处 《电路与系统学报》 CSCD 北大核心 2010年第1期108-112,85,共6页 Journal of Circuits and Systems
基金 天津市自然科学基金(09JCYBJC00700)
关键词 动态偏置 低噪声放大器 动态范围 噪声系数 IIP3 adjustable bias LNA dynamic range noise figure ⅡP3
分类号 TN722.3 [电子电信—电路与系统]
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参考文献9

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同被引文献7

  • 1Andrei Grebennikov.射频与微波放大器设计[M].张玉兴,等译.北京:电子工业出版社,2006:144--165.
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  • 3Ludovic Bacqu6, Philippe Bouysse, William Rebernak, et al. High-Current-High Speed Dynamic Bias Control System Applied to a 100-W Wideband Push-Pull Am plifier[J]. IEEE Trans. Microw. Theory Tech,2008,56 (12).
  • 4Kai Yuan, Taijun Liu, Yan Ye. High Efficiency RF Power Amplifiers with Dynamic Biases for TD-SCDMA Systems [ C]//The 5th international Conference on Wireless Communications, Networking and Mobile Computing, Beijing, 2009 :24- 26.
  • 5J. Van, S. Jung, H. hancement for power switching technique [J]. 2008,44(5) Park, 1VL et al. Efficiency enamplifiers using dynamic bias ELECTRONICS LETTERS,.
  • 6ReinholdLudwig PavelBretchko 王子宇译.射频电路设计-理论与应用[M].北京:电子工业出版社,2002..
  • 7何松柏,游飞.动态偏置射频功率放大器研究[J].电子科技大学学报,2009,38(2):190-193. 被引量：4

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电路与系统学报
2010年 第1期

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