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Noise (electronics) - Wikipedia, the free encyclopedia. Analog display of random fluctuations in voltage in pink noise. In electronics, noise is a random fluctuation in an electrical signal, a characteristic of all electroniccircuits.

Thermal noise is unavoidable at non- zero temperature (see fluctuation- dissipation theorem), while other types depend mostly on device type (such as shot noise. The noise is a summation of unwanted or disturbing energy from natural and sometimes man- made sources. Noise is, however, typically distinguished from interference. Noise is also typically distinguished from distortion, which is an unwanted systematic alteration of the signal waveform by the communication equipment, for example in the signal- to- noise and distortion ratio (SINAD). While noise is generally unwanted, it can serve a useful purpose in some applications, such as random number generation or dither.

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Noise types. The amplitude of the signal has very nearly a Gaussian probability density function. A communication system affected by thermal noise is often modeled as an additive white Gaussian noise (AWGN) channel. The root mean square (RMS) voltage due to thermal noise vn.

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Those discrete arrivals exhibit shot noise. The output of a shot noise generator is easily set by the current. Typically, the barrier in a diode is used.

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The current is a flow of discrete charges, and the fluctuation in the arrivals of those charges creates shot noise. Shot noise is similar to the noise created by rain falling on a tin roof. The flow of rain may be relatively constant, but the raindrops arrive discretely. The root- mean- square value of the shot noise current in is given by the Schottky formulain=2. Iq. Vacuum tubes have shot noise because the electrons randomly leave the cathode and arrive at the anode (plate). A tube may not exhibit the full shot noise effect: the presence of a space charge tends to smooth out the arrival times (and thus reduce the randomness of the current). Conductors and resistors typically do not exhibit shot noise because the electrons thermalize and move diffusively within the material; the electrons do not have discrete arrivial times.

Shot noise has been demonstrated in mesoscopic resistors when the size of the resistive element becomes shorter than the electron- phonon scattering length. It occurs in almost all electronic devices, and results from a variety of effects, though always related to a direct current.

Burst noise. Each shift in offset voltage or current lasts for several milliseconds, and the intervals between pulses tend to be in the audio range (less than 1. Hz), leading to the term popcorn noise for the popping or crackling sounds it produces in audio circuits. Transit- time noise. From the frequency at which this effect becomes significant it goes on increasing with frequency and quickly dominates over other terms.

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Coupled noise. Generally this is done by fundamental interaction, in electronics mainly by inductive coupling and/or capacitive coupling. Intermodulation noise. These noises are produced by the discharge present in all these operations. Noise from outside the Earth includes: Solar noise. Under normal conditions there is constant radiation from the Sun due to its high temperature. Electrical disturbances such as corona discharges, as well as sunspots can produce additional noise.

Cosmic noise. While these stars are too far away to individually affect terrestrial communications systems, their large number leads to appreciable collective effects. Cosmic noise has been observed in a range from 8 MHz to 1. GHz. Reduction of electromagnetic noise coupling. Musik Download Charts Deutschland there. When creating a circuit, one usually wants a true output of what the circuit has accomplished. There are many different noise reduction techniques that can change a noisy altered output signal to a more theoretical output signal. Faraday cage . The Faraday cage can be thought of as an enclosure that separates the complete circuit from outside power lines and any other signal that may alter the true signal.

A Faraday cage will usually block out most electromagnetic and electrostatic noise. Capacitive coupling . If this happens an AC signal from one part of the circuit can be accidentally picked up in another part. The two resistors (conductors) act like a capacitor thus transferring AC signals.

There may be other reasons for which capacitive coupling is wanted but then it would not be thought of as electronic noise.