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Shot noise in metallic resistor

Discussion in 'Electronic Basics' started by Fred Chen, Nov 28, 2004.

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  1. Fred Chen

    Fred Chen Guest

    There has been some discussion on shot noise, which ultimately
    referred to Art of Electronics 2nd ed. ch 7.11. The "current in a
    simple resistive circuit has far less noise than predicted by the
    shot-noise formula." I have not looked into this issue for a while but
    reading up on stuff I could get my hands on, it looks like
    electron-phonon interaction length is short enough at room temperature
    to guarantee that electrons thermalize with the metal lattice, thus
    enabling the shot noise to be suppressed. The interesting bit is when
    the resistor length drops below the electron-phonon length, as long as
    transport is not ballistic, the shot noise is only partially
    suppressed (factor of 1/3 for the independent hot electron case and
    sqrt(3)/4 for the interacting hot electron case).

    Fred
     
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