超低温宽带高超噪比噪声源的设计与测量  

Design and measurement of cryogenic broadband noise source with high power

作　　者：何川 刘玲玲[1,2] 吴志华 刘文其[1,2] He Chuan;Liu Lingling;Wu Zhihua;Liu Wenqi(The 16th Research Institute of China Electronic Technology Group Corporation,Hefei 230088,China;R&D Centre of Cryoelectronics,China Electronic Technology Group Corporation,Hefei 230088,China)

机构地区：[1]中国电子科技集团公司第十六研究所,合肥230088 [2]中国电子科技集团公司低温电子研发中心,合肥230088

出　　处：《低温与超导》2023年第1期94-98,共5页Cryogenics and Superconductivity

基　　金：国家重点研发计划(2017YFE0132700)资助。

摘　　要：为了测量射电望远镜低温接收机系统实时的等效噪声温度,通过测试噪声二极管在20 K温区下的散射参数(S参数)的基础上,设计宽带阻抗匹配电路,研制了一款能够在20 K以下温区稳定工作的噪声源,构建了低温噪声源超噪比测试平台,在1 GHz~10 GHz频段范围内,噪声源超噪比大于25 dB,超噪比平坦度小于±1.5 dB,具有噪声信号输出的控制功能。To measure the real-time equivalent noise temperature of the radio telescope cryogenic receiver system,the scattering parameter(S parameter)of the noise diode at 20 K was tested,a broadband impedance matching circuit was designed,a noise source to be able to work at 20K was developed.A test bench for excess noise ratio(ENR)of the noise source was assembled.In 1 to 10 GHz frequency band,the excess noise ratio is better than 25 dB,its flatness is less than±1.5 dB,and the noise signal output is controlled.

关 键 词：微波噪声源 超噪比 超低温 宽带 

分 类 号：TN72[电子电信—电路与系统]