# Noise Temperature

**The noise temperature at a resistor depends upon**

**Options: **

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 T_{n} of any white noise source is defined by

T_{n}= P_{n}/KB

Where P_{n} 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 P_{n} is delivered.

The equivalent noise temperature T_{n} in terms of noise figure may be defined as

T_{n}= T_{0} (F-1)

where F is the noise figure

T_{0 }=170C

= 290K