Noise and Noise Measurements
In frequency domain measurements, electronic noise is a concern in two distinctly different ways. The first case is when the measurement of a particular parameter is affected by the presence of unwanted noise. Here, the noise is a nuisance. For example, we could be measuring the distortion of a particular amplifier with the amplifier's noise getting in the way. The second case occurs when the noise present in the system is the parameter to be measured. In that same amplifier, we may want to measure how much noise is present at the output. Many of the same principles apply to both cases, but it is important to focus on whether the noise is the measurement or whether it degrades the accuracy of the measurement.
Noise and Noise Measurements, Page 1 of 2
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