220 GHz铌基超导隧道结混频器设计  

Design of 220 GHz Nb superconducting tunnel junction mixer

作　　者：夏丹蕾 何明[1,2,3] 季鲁[1] 左涛 郭子玥[1] Xia Danlei;He Ming;Ji Lu;Zuo Tao;Guo Ziyue(Colege of Electronic Infomation and Optical Engineering,Nankai University,Tianjin 300350,China;Engineing Research Centre of Thin Film Photo-electronics Technology Ministry of Education,Tianjin 300350,China;CETC Brainware Eetronie Technology Co Lid,Hefi 23008,China;The 16th Institute of CETC,Hefei 230088,China)

机构地区：[1]南开大学电子信息与光学工程学院,天津300350 [2]教育部薄膜光电子技术工程研究中心,天津300350 [3]中电博微电子科技有限公司,合肥23008 [4]中国电子科技集团公司第十六研究所,合肥230088

出　　处：《低温与超导》2022年第9期1-7,33,共8页Cryogenics and Superconductivity

基　　金：国家自然科学基金面上项目(61973173)资助。

摘　　要：设计了基于铌(Nb)超导隧道结低噪声220 GHz太赫兹混频器。通过锤型(hammer-head)射频截止滤波器的设计减小芯片尺寸,降低信号传输损耗,同时提供更宽的阻带,阻止射频和本振信号的泄露。为有效提高混频效率,建立隧道结模型优化混频电路,使信号平均传输到每个结上。结合软件仿真和数值模拟得到混频器在180-250 GHz的射频范围内具有正向的变频增益,中频输出带宽达到15 GHz,噪声温度小于20 K,介于两倍和三倍量子极限之间。结果表明该设计具有突出的射频、中频带宽和极高的灵敏度。A low-noise 220 GHz mixer at Terahertz band based on the Nb superconducting tunnel junctions was designed.Harmmer-head RF chock filter was managed to reduce the chip size and decrease the signal transmission loss, while a wider stop-band was provided to prevent the leakage of RF and LO signals. In order to improve mixing efficiency, a model of the tunnel junction was established for optimizing the mixing circuit so that the signal can be transmitted equally to each junction. Combining with software simulation and numerical simulation, conversion gain is proved to be positive in the RF range of 180-250 GHz, and the IF frequency output bandwidth reaches 15 GHz, while the noise temperature is less than 20 K that is between twice and triple the quantum limit.The simulation results show the prominent RF and IF bandwidth and high sensitivity can be achieved.

关 键 词：超导隧道结 混频器 太赫兹 低通滤波器 

分 类 号：TN773.4[电子电信—电路与系统] TM26[一般工业技术—材料科学与工程]