The noise temperature analysis on a space-grade cryogenic low noise amplifier using two measurement methods

IF 1.6 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS Radio Science Pub Date : 2025-01-01 DOI:10.1029/2024RS008023

Junda Jin;Jie Liu;Dong Liu;Jiang-Qiao Ding;Xuan Zhang;Jing Li;Sheng-Cai Shi

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Abstract

The noise of a cryogenic low-noise amplifier (cryo-LNA) directly impacts the sensitivity of a terahertz superconducting heterodyne receiver. This paper aims to evaluate the noise temperature of a cryo-LNA and its suitability as the first stage IF amplifier for the heterodyne receiver, specifically the high-sensitivity terahertz detection module for the China Space Station Survey Telescope. Both the Cold Attenuator (CA) Method and the Variable Temperature Load (VTL) Method are employed to ensure confidence in the measured values. The maximum difference in results is 1K within the frequency range of 0.1–2 GHz, contributing to an uncertainty of 4K in the receiver's noise temperature. The measurement accuracy of the noise temperature is analyzed in detail, with particular emphasis on the influence of the cryogenic attenuator and the noise contribution from the connecting cable with a temperature gradient. Additionally, the dependence of the cryo-LNA's noise temperature on physical temperature and radiation hardness are verified to assess suitability for space applications.

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来源期刊

Radio Science 工程技术-地球化学与地球物理

CiteScore

3.30

自引率

12.50%

发文量

112

审稿时长

1 months

期刊介绍： Radio Science (RDS) publishes original scientific contributions on radio-frequency electromagnetic-propagation and its applications. Contributions covering measurement, modelling, prediction and forecasting techniques pertinent to fields and waves - including antennas, signals and systems, the terrestrial and space environment and radio propagation problems in radio astronomy - are welcome. Contributions may address propagation through, interaction with, and remote sensing of structures, geophysical media, plasmas, and materials, as well as the application of radio frequency electromagnetic techniques to remote sensing of the Earth and other bodies in the solar system.