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Communication SystemsReceiver Fundamentals

A low-noise amplifier at the front end of a receiver is mainly used to?

  • AProvide gain while adding as little noise as practical
  • BSuppress the desired signal
  • CConvert all signals to DC
  • DMake channel bandwidth infinite
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Correct Answer: A. Provide gain while adding as little noise as practical
Explanation: An LNA amplifies weak received signals with minimal added noise, helping preserve receiver SNR.
Reference: Standard communication systems: receiver fundamentals
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