Noise factor for a system is defined as the ratio of

Q.  Noise factor for a system is defined as the ratio of
- Published on 15 Oct 15

a. Input noise power (Pno) to output noise power (Pni)
b. Output noise power (Pno) to input noise power (Pni)
c. Output noise power (Pno) to input signal power (Psi)
d. Output signal power (Pso) to input noise power (Pni)

ANSWER: Output noise power (Pno) to input noise power (Pni)
 
The noise factor of a system is defined as the ratio of output noise power (Pno) to input noise power (Pni):
Fn = Pno/ Pni, at standard room temperature 290K
= Pno/GKBT0

The input noise power is Pni = GKBT0,
G is the gain of the amplifier
K = 1.38 X 10-23 J/°K, Boltzmann's constant
B is the bandwidth of the network in hertz (Hz)
To = 290°K
Noise factor may also be defined as the ratio of Signal to Noise ratio at the output to Signal to Noise ratio at the input.
i.e., Fn = Sni/ Sno

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