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.
作者
何川
刘玲玲
吴志华
刘文其
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)
出处
《低温与超导》
CAS
北大核心
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。
关键词
微波噪声源
超噪比
超低温
宽带
Microwave noise source
ENR
Cryogenic
Broadband
