GATE EC 2016 Set 1 — Question 62
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Communications → Random Processes → Noise Power & Bandwidth
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Question
An antenna pointing in a certain direction has a noise temperature of . The ambient temperature is . The antenna is connected to a pre-amplifier that has a noise figure of and an available gain of over an effective bandwidth of . The effective input noise temperature for the amplifier and the noise power at the output of the preamplifier, respectively, are
Correct answer
(A) Tₑ = 169.36 K and Pₐₒ = 3.73 × 10⁻¹⁰ W
Solution
1.Calculate the Noise Figure () in linear scale:
2.Calculate the effective input noise temperature () of the amplifier:
This is closest to in option (A).
3.Calculate the total system noise temperature at the input ():
4.Calculate the output noise power ():
Where:
- (Boltzmann constant)
This is closest to in option (A).
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