基于电流模结构的超宽带无源混频器设计  

Design of UWB Passive Mixer Based on Current Mode Structure

作　　者：李潇然[1,2,3,4] 王乾 雷蕾 刘自成[3] 韩放[4] 齐全文 王兴华 LI Xiaoran;WANG Qian;LEI Lei;LIU Zicheng;HAN Fang;QI Quanwen;WANG Xinghua(School of Integrated Circuits and Electronics,Beijing Institute of Technology,Beijing 100081,China;Advanced Technology Research Institute,Beijing Institute of Technology,Jinan,Shandong 250300,China;Chongqing Institute of Microelectronics and Microsystems,Beijing Institute of Technology,Chongqing 401332,China;Yangtze Delta Region Academy of Beijing Institute of Technology,Jiaxing,Zhejiang 314000,China)

机构地区：[1]北京理工大学集成电路与电子学院,北京100081 [2]北京理工大学前沿技术研究院,山东济南250300 [3]北京理工大学重庆微电子研究院,重庆401332 [4]北京理工大学长三角研究院(嘉兴),浙江嘉兴314000

出　　处：《北京理工大学学报》2024年第6期655-660,共6页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(62101038);北京理工大学青年教师学术启动计划(XSQD-202105006)。

摘　　要：采用SMIC 55 nm CMOS工艺,提出基于电流模结构的2~8 GHz超宽带高线性度直接下变频无源混频器结构.本设计主要结构为低噪声跨导放大器(low noise transconductance amplifier,LNTA)驱动I/Q两路电流模无源混频器,负载为低输入阻抗的跨阻放大器(trans-impedance amplifier,TIA),即LNTA-Passive Mixer-TIA结构.LNTA采用电容交叉耦合以及双端正反馈结构,解决阻抗匹配以及噪声等关键参数的折中问题.整个接收机链路获得较好的线性度及噪声性能,对于电源电压以及衬底噪声的鲁棒性也有所提升.后仿结果表明,在电源电压1.2 V情况下,射频输入信号频率为2~8 GHz,1 dB压缩点为−5.5 dBm,带内输入三阶交调点为−1 dBm,整体噪声系数为4 dB,核心版图面积为0.12 mm^(2).Based on SMIC 55nm CMOS technology,a 2~8 GHz UWB high linearity direct down-conversion passive mixer structure was proposed based on current mode structure.The main structure of this design was arranged according to the LNTA-Passive Mixer-TIA structure,taking a Low Noise Transconductance Amplifier(LNTA)to drive I/Q two-channel current mode passive mixer with a low input impedance Trans-impedance Amplifier(TIA)as load.Making use of capacitive cross-coupling and double-end feedback structure,the LNTA was designed to solve the compromise problem of key parameters such as impedance matching and noise.The whole receiver link was arranged to achieve better linearity and noise performance,and improve the robustness of the power supply voltage and substrate noise.The simulation results show that under 1.2 V power supply voltage,the following results can be obtained,2~8 GHz RF input signal frequency,−5.5 dBm linearity for 1 dB compression point input,−1 dBm in-band input third-order crossover point,4 dB overall noise factor,and 0.12 mm^(2)core layout area.

关 键 词：超宽带 低噪声跨导放大器 直接下变频无源混频器 跨阻放大器 CMOS工艺 

分 类 号：TN432[电子电信—微电子学与固体电子学]