Journal
AMERICAN JOURNAL OF PHYSICS
Volume 74, Issue 5, Pages 438-440Publisher
AMER ASSOC PHYSICS TEACHERS AMER INST PHYSICS
DOI: 10.1119/1.2174034
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Shot noise and Johnson noise in electrical circuits are usually introduced by referring to completely separate physical models and derivations. We derive Johnson and shot noise expressions from the same physical model, an ideal tunnel junction, to show the deep connection between the two types of noise. The derivation uses concepts of quantum mechanics, thermodynamics, and signal processing. (C) 2006 American Association of Physics Teachers.
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