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TYPES OF ELECTRONIC NOISE Gaussian noise See Also: Gaussian noise Gaussian noise is noise that has a Probability Density Function (pdf) of the Normal Distribution (aka Gaussian distribution). It is most commonly used as additive white noise to yield Additive White Gaussian Noise (AWGN). Shot noise in resistors See Also: Shot noise Shot noise in electronic devices consists of random fluctuations of the Electric Current in an electrical Conductor , which are caused by the fact that the current is carried by discrete charges ( Electrons ). Johnson-Nyquist noise See Also: Johnson-Nyquist noise Johnson-Nyquist noise (sometimes '''thermal noise''', '''Johnson noise''' or '''Nyquist noise''') is the Noise generated by the Equilibrium fluctuations of the Electric Current inside an Electrical Conductor , which happens regardless of any applied Voltage , due to the random thermal motion of the charge carriers (the Electron s). White noise See Also: White noise White noise is a random signal (or process) with a flat power Spectral Density . In other words, the signal's power spectral density has equal power in any band, at any centre Frequency , having a given Bandwidth . An infinite-bandwidth white noise signal is purely a theoretical construct. By having power at all frequencies, the total power of such a signal is infinite. In practice, a signal can be "white" with a flat spectrum over a defined frequency band. Pink, flicker or 1/f noise See Also: 1/f noise Pink noise, also known as 1/f noise, is a signal or process with a Frequency Spectrum such that the Power Spectral Density is proportional to the reciprocal of the frequency. Sometimes pronounced as one over f noise, it is also called flicker noise. In other words, it is a sound that falls off steadily into the higher frequencies, instead of producing all frequencies equally. EXTERNAL LINKS |
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