低Q 值匹配网络超宽带低噪声放大器设计 - 电子器件.PDF

第37 卷 第4 期 电 子 器 件 Vol.37摇 No.4 2014年8 月 ChineseJournal of Electron Devices Aug.2014 Design of Ultra Wideband Low Noise Amplifier Based on Low Q Value of Matching Network* * DUHaiming ,ZHONGJisheng,ZHAOHongmei,CUI Guangzhao (College of Electric and Information Engineering,Zhengzhou University of Light Industry,Zhengzhou450002,China) Abstract:A novel LNA(Low Noise Amplifier)is proposed by using low Q value of matching network.The LC filtering circuit ismerged in biasing circuit in order to reduce the noise of system and to monitor the Qvalue of the matching network in the design;By choosing the suitable feedback loop to raise the bandwidth of the LNA and to adjust the Q value of the matching network;By taking advantage of the structure of matching circuit and the optimization of the Q value,a few problems of Amplifier is settled down,such as the narrow bandwidth,the high noise and the low gain. The LNA is measured under the bandwidth of 1.5 GHz ~2.5 GHz,the ripple wave characteristic is lower than 1dB,moreover the gain is25 dB.The measured result is compared with the simulation result,it can be verified the design is reasonable. And the structure of the design method is simple and the performance is more superior,meanwhile the application iswide. Key words:LNA;matching network;low Qvalue;ultra wideband EEACC:5230摇 摇 摇 摇 doi:10.3969/j.issn.1005-9490.2014.04.012 低 Q值匹配网络超宽带低噪声放大器设计* * 杜海明 ,仲继生,赵红梅,崔光照 (郑州轻工业学院电气信息工程学院,郑州450002) 摘摇 要:提出了一种基于低Q值匹配网络的超宽带低噪声放大器(LNA)的设计方法。 该方法将LC滤波电路加入偏置电路 中,以降低系统噪声同时调节匹配网络Q值;通过选择合适的反馈回路,提高LNA 的带宽并调节匹配网路 Q值;利用匹配电 路结构及优化的Q值,解决了放大器频带窄、噪声高、增益低的问题。 测试结果表明,在频段1.5 GHz~2.5 GHz 内,其纹波特 性低于1dB,增益达到25 dB。 将实测结果与仿真结果相比较,验证了该设计方法的合理性,与传统LNA设计方法相比,采用 低Q值匹配网络的设计方法结构简单、性能