Dependence of noise temperature on physical temperature for cryogenic low-noise amplifiers

作者：McCulloch Mark A^*; Grahn Jan; Melhuish Simon J; Nilsson Per Ake; Piccirillo Lucio; Schleeh Joel; Wadefalk Niklas

来源：Journal of Astronomical Telescopes, Instruments, and Systems, 2017, 3(1): 014003.

DOI：10.1117/1.JATIS.3.1.014003

• amplifiers
• microwaves
• technology
• telescopes

We present the results of noise-temperature measurements for four radio astronomy MMIC low-noise amplifiers (LNAs) at physical temperatures from 2 to 160 K. We observe and confirm recent reports that the noise temperature of an LNA exhibits a quadratic dependence with respect to the physical temperature. We are also able to confirm the prediction by Pospieszalski that below a certain physical temperature there is no further significant reduction in noise temperature. We then discuss these results in the context of both the Pospieszalski noise model and some recent Monte-Carlo simulations, which have implied that at very low temperatures, heating of the electron channel above ambient temperature may help to explain the behavior of the drain temperature parameter.

• 出版日期2017-1