1.University of Science and Technology of China;2.Purple Mountain Observatory;3.Chinese University of Hong Kong;4.Purple Mountain Observatory,Chinese Academy of Sciences
The Key Program of the Chinese Academy of Sciences, The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
零差混频系统（Homodyne mixing system）对太赫兹超导动态电感探测器（Kinetic inductance detectors, KIDs）性能表征具有重要的作用。然而，零差混频系统仍存在混频器不平衡性、测量系统集成、干扰信号等问题。作者设计新型的单通道零差混频硬件系统，结合软件算法实现了测量系统的集成化、IQ混频器不平衡性校准、KID的性能表征；同时实现了在VNA（vector network analyzer）CW模式下的KIDs噪声测量；以及基于自相关算法的双通道零差混频硬件电路设计，有效的抑制了干扰信号。值得注意的是，这些研究成果被应用于表征KIDs 性能，对KIDs阵列设计起到了重要的作用。 关键词: KIDs；零差混频系统；太赫兹；自相关算法；
The homodyne mixing system is used to characterizing the performance of terahertz superconducting kinetic inductance detectors (KIDs). However, homodyne mixing systems still have issues such as mixer imbalance, measurement system integration, and interference signals. The author designed a new single channel homodyne mixing hardware system and software algorithms to achieve integration of the measurement system, calibration of IQ-mixer imbalance, and performance characterization of KID; Furthermore, noise measurement of KIDs in VNA (vector network analyzer) CW mode is achieved; Finally, the method of hardware circuit design by dual channel homodyne mixing system based on autocorrelation algorithm effectively suppresses interference signals. It is worth noting that these research results are applied to characterize the performance of KIDs, which is important in the design of KIDs arrays.