Encyclopedia > Johnson-Nyquist noise

  Article Content

Johnson-Nyquist noise

Johnson-Nyquist noise (sometimes only "Nyquist noise") is the equilibrium fluctuations of the electric current inside an electrical conductor, which happen without any applied voltage, due to the random thermal motion of the charge carriers (the electrons).

It is to be distinguished from Shot noise, which describes the additional current fluctuations that occur when a voltage is applied and a macroscopic current starts to flow.

The strength of Nyquist noise is related to the temperature and the resistance of the conductor.

See: Harry Nyquist, J. Johnson

  • J. Johnson, "Thermal Agitation of Electricity in Conductors", Phys. Rev. 32, 97 (1928) -- the experiment
  • H. Nyquist, "Thermal Agitation of Electric Charge in Conductors", Phys. Rev. 32, 110 (1928) -- the theory



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Digital Rights Management

... pointers. An early example of a DRM system is the Content Scrambling System (CSS) employed by the DVD Consortium[?] on movie DVD disks. The data on the DVD is encrypted ...

 
 
 
This page was created in 37.1 ms