Noise Analysis for Amplifiers with Superconducting Input
作者:
V. Radhakrishnan,
V. L. Newhouse,
期刊:
Journal of Applied Physics
(AIP Available online 1971)
卷期:
Volume 42,
issue 1
页码: 129-132
ISSN:0021-8979
年代: 1971
DOI:10.1063/1.1659544
出版商: AIP
数据来源: AIP
摘要:
A method is developed to adapt the conventional definition of the noise temperature to amplifiers with superconducting inputs. In particular this method is applied to a crossed‐film cryotron amplifier with a superconducting input to calculate its noise temperature. We then compare it with that of other amplifiers and masers. In addition to the noise temperature, a new criterion is evolved here: to estimate the figure of merit of amplifiers and detectors. This involves a new parameter called herein the action factor, which is the product of the smallest energy measurable by a device, with its smallest possible response time. The action factor and the noise temperature are worked out for the cryotron and a few other amplifiers and detectors for comparison. The advantage of the cryotron amplifier is brought out.
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