Formula
vn
thermal noise voltage
kB
Boltzmann\'s constant
T
the resistor\'s absolute temperature
R
the resistor value
Deltaf
the bandwidth in hertz over which the noise is measured
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Thermal noise voltage
Formula description
Johnson-Nyquist noise (thermal noise, Johnson noise, or Nyquist noise) is the electronic noise generated by the thermal agitation of the charge carriers (usually the electrons) inside an electrical conductor at equilibrium, which happens regardless of any applied voltage.
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kB
T
R
Deltaf
vn
Precision
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