Abstract
Quantitatively, the noise of a linear amplifier can be described as the noise power added by the amplifier to the signal power in the process of signal amplification. It has been found convenient to refer both the noise power and the signal power to the input of the amplifier, before amplification, because then one can make a direct comparison between the amplifier noise and the thermal noise that accompanies the signal. We have gone so far as to express the noise ascribed to the amplifier in Kelvin, namely, in terms of the thermal power that would be emitted by a thermal source if it were at this temperature.
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© 2000 Springer-Verlag Berlin Heidelberg
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Haus, H.A. (2000). Introduction. In: Electromagnetic Noise and Quantum Optical Measurements. Advanced Texts in Physics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04190-1_1
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DOI: https://doi.org/10.1007/978-3-662-04190-1_1
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-08462-1
Online ISBN: 978-3-662-04190-1
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