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Shot Noise |
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shot noise (Schottky noise) The random emission and velocity of electrons from a cathode, which was discovered by Walter Schottky. See Schottky.shot noise [′shät ‚nȯiz] (electronics) Noise voltage developed in a thermionic tube because of the random variations in the number and the velocity of electrons emitted by the heated cathode; the effect causes sputtering or popping sounds in radio receivers and snow effects in television pictures. Also known as Schottky noise; shot effect. Shot Noise random changes (fluctuations) in voltage and current relative to their mean value in the circuits of amplifiers, radios, and other electronic devices; caused by the shot effect in vacuum electronic and semiconductor instruments. For example, shot noise appears as acoustic noise in the loudspeaker of a radio, “snow” on a television screen, and “grass” on a radar screen. Shot noise is the basic component of the internal noises of electronic devices, which cause the distortion of weak signals and limit the sensitivity of amplifiers. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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