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Lucy Liang added Since_Johson_noise_occurs_because__.tex
over 8 years ago
Commit id: d693f224c0ed42364ee6262c079239025f1f792a
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Since Johson noise occurs because of the imbalance of charge in a conductor due to thermal fluctuations, it is not difficult to think about the physical reasons behind the relation of Johnson noise and the variables stated in Equation \ref{eq:Equatoin}. If $R$ is greater, there could be more charges that can contribute to the imbalance, increasing the noise. If equivalent bandwidth $\Delta f$ increases, the signal is averaged over a greater frequency range, less portion of the signal is being filtered out, increasing the final noise signal. If the temperature is increased, there is more thermal energy within each electron, allowing them to have a greater kinetic energy, which would result in greater fluctuations in the thermal noise, giving a higher fluctuating voltage reading.
