Noise temperature: At a pair of terminals, the temperature of a passive
system having an available
noise power per unit
bandwidth at a specified
frequency equal to that of the actual terminals of a
network. The noise temperature of a simple resistor is the actual temperature of that resistor. The noise temperature of a diode may be many times the actual temperature of the diode. That is, we could replace the diode with a resistor and place that resistor to the equivalent temperature to generate the same level of the noise. Similarly, we can model a terrestrial antenna to have a noise temperature of 290K if the noise level of the resistor at 290K (=16.8C) is the same as the noise level of the antenna.
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At a pair of terminals, the temperature of a passive
system having an available
noise power per unit
bandwidth at a specified
frequency equal to that of the actual terminals of a
network. Note: The noise temperature of a simple resistor is the actual temperature of that resistor. The noise temperature of a diode may be many times the actual temperature of the diode.
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