noise power

The electromagnetic waves emitted into the air from wiring as radiated noise, converted into power. Since the noise power is caused by the thermal motion of electrons determined by the temperature of a resistor (conductor), it is also called thermal noise. The noise power Pn generated from a resistor (conductor) is expressed by the following equation, where the Boltzmann constant is k (J/K), absolute temperature is T (K), and frequency bandwidth is B (Hz):

Pn = kTB (W)

When expressing noise power, 1PW is used as the reference, and decibel (dBPW) obtained by taking the logarithm is used.