Noise Temperature

The noise temperature at a resistor depends upon


a) Resistance value
b) Noise power
c) Resistance value and noise power,both
d) None of the above

Correct Answer: b) Noise power

Explanation :

The noise temperature Tn of any white noise source is defined by
Tn= Pn/KB
Where Pn is the noise power
K = 1.381×10-23 J/K, joules per Kelvin, the Boltzmann constant
B is the bandwidth at which the power Pn is delivered.
The equivalent noise temperature Tn in terms of noise figure may be defined as
Tn= T0 (F-1)
where F is the noise figure
T0 =170C
= 290K
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