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Communication SystemsNoise Figure

In a cascade of receiver stages, the overall noise performance is especially sensitive to the noise characteristics of the?

  • AFirst stage
  • BLast stage only
  • CPower supply only
  • DAntenna cable length only regardless of loss
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Correct Answer: A. First stage
Explanation: Friis' formula shows that noise added by early stages is most important because later-stage noise contributions are divided by preceding gain.
Reference: Standard communication systems: noise figure
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