Noise and Noise Measurements

Noise and Noise Measurements

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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.

Chapter Contents:

  • 8.1 Statistical Nature of Random Noise
  • 8.2 Mean, Variance, and Standard Deviation
  • 8.3 Power Spectral Density
  • 8.4 Frequency Distribution of Noise
  • 8.5 Noise Equivalent Bandwidth
  • 8.6 Noise Units and Decibel Relationships
  • 8.7 Noise Measurement
  • 8.8 Automatic Noise Level Measurement
  • 8.9 Noise Floor
  • 8.10 Correction for Noise Floor
  • 8.11 Phase Noise
  • References

Inspec keywords: amplifiers; distortion; electric noise measurement

Other keywords: noise measurements; distortion; amplifier; frequency domain measurements; electronic noise; unwanted noise

Subjects: Amplifiers; Electric noise and interference measurement

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