This chapter provides an elementary introduction to shot noise, which is as ubiquitous as thermal noise. Shot noise refers to electrical fluctuations caused by the discreteness of electronic charge. The most typical example concerns the emission of electrons from the cathode of a vacuum tube. Shot noise is related to discrete random events which, in general, are neither Gaussian nor Markovian. This chapter also discusses Campbell's two theorems on shot noise, along with the spectrum of filtered shot noise, transit time effects, electromagnetic theory of shot noise, space charge limiting diode, and Rice's generalisation of Campbell's theorems.
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