15 March 2017 Dependence of noise temperature on physical temperature for cryogenic low-noise amplifiers
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Abstract
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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Mark A. McCulloch, Mark A. McCulloch, Jan Grahn, Jan Grahn, Simon J. Melhuish, Simon J. Melhuish, Per-Ake Nilsson, Per-Ake Nilsson, Lucio Piccirillo, Lucio Piccirillo, Joel Schleeh, Joel Schleeh, Niklas Wadefalk, Niklas Wadefalk, } "Dependence of noise temperature on physical temperature for cryogenic low-noise amplifiers," Journal of Astronomical Telescopes, Instruments, and Systems 3(1), 014003 (15 March 2017). https://doi.org/10.1117/1.JATIS.3.1.014003 . Submission: Received: 16 December 2016; Accepted: 28 February 2017
Received: 16 December 2016; Accepted: 28 February 2017; Published: 15 March 2017
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