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6/1/16: Digital processing affect on noise analysis

How does digital processing, such as an FFT or an FIR filter, affect the noise and the noise analysis process?

[edited by: lallison at 3:56 PM (GMT -4) on 6 Jun 2022]
  • You still need to ensure that the total noise at the input to any given device in your circuit does not exceed the input range of that circuit, for example, noise could be saturating the ADC input or the input of a gain stage. Beyond that, an FFT will take noise that is spread out over frequency and separate it into bins, or oversampling/digital filtering/decimation techniques will filter out some noise and improve the SNR of the measurement.