Question
Communication Systems Question on Noise Temperature and Noise Figure
The first stage of a two-stage amplifier has a voltage gain of 10, input resistance 600 Ω, equivalent noise resistance 1600 Ω and output resistance 27 KΩ. For a second stage, these values are 25, 81 kΩ and 1 MΩ, respectively. If it is driven by the generator with output impedance 50 Ω, find the noise figure of the amplifier.
A
38.4
B
39.4
C
1.002
D
2.04
Answer
39.4
Explanation
Solution
The Correct answer is option (B) : 39.4