Discussion
What does the Friis formula imply about receiver design?
Answer: A
Because later contributions are divided by the gain preceding them, the first stage dominates, which is why a low-noise amplifier is placed as close to the antenna as possible, sometimes at the antenna itself. Equal contribution would make the ordering irrelevant, which it emphatically is not. Optimising the last stage buys almost nothing. And adequate early gain is precisely what suppresses later noise. One formula dictates the whole architecture of a sensitive receiver.
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