超导探测器低温低噪声读出及复用技术研究

The superconducting tunnel junction (SIS) mixer has been widely used on millimeter-wave, sub-millimeter-wave and terahertz astronomical observation because of its close to quantum limit high sensitivity. To meet the demand on low noise DC bias for SIS mixer and multiplexing bias for next generation multi-beam superconducting mixers receiver system, this project will mainly study: .1) The correlation between the noise temperature of superconducting mixer and DC bias point. The influence on the mixer performance caused by DC bias and readout circuit noise..2) The low temperature characteristic analysis and characterization of the key components in DC bias and readout circuits..3) The performance optimization technology and experimental verification based on SIS array receiver. .The results of this project are expected to apply to the High Sensitivity Terahertz Detection Module (HSTDM) of Chinese Space Station Telescope (CSST). It also has the application prospects in next generation multi-beam receiver developing.

超导隧道结（SIS）混频器具有接近量子极限的超高灵敏度，已被广泛应用于毫米波、亚毫米波及太赫兹天文观测中。针对超导SIS混频器对低噪声偏置电路的需求,以及下一代多波束超导混频接收机在直流偏置复用方面的需求,本项目将主要研究：超导SIS混频器噪声温度与直流偏置的相关性,以及直流偏置及读出电路噪声对混频器性能的影响；偏置及读出电路关键元器件的低温特性分析与表征；基于SIS阵列接收机性能优化技术以及试验验证。该项目研究结果有望应用于我国空间站望远镜搭载的高灵敏度太赫兹探测模块，在下一代多波束接收机研制中也有应用前景。

超导隧道结（SIS）混频器具有接近量子极限的超高灵敏度，已被广泛应用于毫米波、亚毫米波及太赫兹天文观测中。针对超导SIS混频器对低噪声偏置电路的需求,以及下一代多波束超导混频接收机在直流偏置复用方面的需求,本项目将主要研究：超导SIS混频器噪声温度与直流偏置的相关性,以及直流偏置及读出电路噪声对混频器性能的影响；偏置及读出电路关键元器件的低温特性分析与表征；基于SIS阵列接收机性能优化技术以及实验验证。本项目主要完成了偏置电路放大器芯片低温特性表征以及4像元超导混频器偏置电路的研制，对今后研究低温下偏置复用技术提供技术支持。