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If a matched attenuator with a loss of 3.2 dB is placed between the source and the amplifier’s input, what is the operating spot noise figure of the attenuator amplifier cascade if the attenuator’s physical temperature is 290 K?
  • a)
    9 db
  • b)
    11.3 db
  • c)
    10.4 db
  • d)
    13.3 db
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
If a matched attenuator with a loss of 3.2 dB is placed between the so...
Here Te is 290[(20.89-1) + (2.089)(7.98-1)] or 4544.4K. Hence the required answer is 1 + 4544.4/290 = 212 or 13.3 db.
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If a matched attenuator with a loss of 3.2 dB is placed between the source and the amplifier’s input, what is the operating spot noise figure of the attenuator amplifier cascade if the attenuator’s physical temperature is 290 K?a)9 dbb)11.3 dbc)10.4 dbd)13.3 dbCorrect answer is option 'D'. Can you explain this answer?
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