Amplification - Other causes of distortion

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An amplifier can introduce other distortions too. Let's take a look at the most evident ones and their causes.

Active components, semiconductors in particular, produce a noise caused by thermal noise (the random movement of electrons within these conductors) [Thermal noise ] . Furthermore if the amplifier has more than one input channel, they may interfere with one another as a result of the electromagnetic induction that is generated between electric components in close proximity.

Another kind of distortion is distortion from inter-modulation. In other words, the interference of two frequencies within the input signal, which generates, through the action of an amplifier, new undesired frequencies.

Lastly, let's take a quick look at phase distortion. As its name suggests, this kind of distortion comes about when an amplifier's output has a frequency that is out of phase in relation to the input signal. The more out of phase it is, the greater the distortion.


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