一种3~5GHz超宽带单端输入差分输出LNA  

Design of a 3~5 GHz LNA with the Function of Both a Single-end Input and Differential Output is Achieved

作　　者：郑羽[1] 段吉海[1] 徐仕超 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《微电子学与计算机》2014年第6期103-106,共4页Microelectronics & Computer

基　　金：国家自然科学基金(61161003;61264001;61166004);广西自然科学基金(2013GXNSFAA019333);广西高校科研教育厅立项项目(201106LX203);桂林电子科技大学博士基金(UF11006;UF12001Y)

摘　　要：采用0.18μm CMOS工艺设计了一种应用于UWB的低噪声放大器(low noise amplifier,LNA).该LNA工作频率为3~5GHz,采用Matlab数学建模方法优化噪声系数,同时采用了单端输入差分输出的电路结构实现信号差分输出;采用了RC反馈技术和源级负反馈技术进行输入宽带匹配.设计使用Cadence软件进行后仿真,仿真结果显示,平均输出增益(S21、S31)为16.1dB,3~5GHz范围内S11【-10.9dB,NF为2.04~2.68dB,差分输出端口最大误差相位为4°.使用1.8V电源供电,直流功耗为18.4mW.In this paper ,a fully integrated ultra-wideband (UWB) low noise amplifier (LNA) employing a cascode topology is designed with 0 .18 μm RF CMOS technology .By using Matlab mathematical modeling of noise figure , the noise figure is optimized .By using a special architecture ,the function of both a single-end input and differential output is achieved .The wideband input impedance matching is conducted by employing an RC feedback network ,a degenerating inductor .The simulation results show that the average power gain (S21 or S31) is about 16 .1 dB and the input return loss (S11) is less than -10 .9 dB over the whole frequency range of 3 to 5 GHz .In addition ,the noise figure (NF) is from 2 .04 to 2 .68 dB ,the max phase error of output port is 4° ,while consuming 18 .4 mW under a 1.8 V single supply voltage .

关 键 词：差分输出LNA 噪声优化 宽带匹配 

分 类 号：TN722.3[电子电信—电路与系统]