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Noise Figure and Noise Temperature

#noise figure#noise temperature#LNA#receiver#sensitivity

Noise Figure and Noise Temperature

Noise figure (NF) and noise temperature (Te) are two ways to express the noise added by a component. This formula converts between them, which is essential for cascaded noise analysis.

Te=T0(F−1)T_e = T_0(F - 1)

Alternative Forms

Noise Figure from Temperature
F=1+TeT0F = 1 + \frac{T_e}{T_0}
Calculate noise factor from equivalent temperature
Noise Figure in dB
NFdB=10log⁡10(F)NF_{dB} = 10\log_{10}(F)
Express noise figure in decibels

Input Variables

dB

Noise figure of the component(Range: 0 – 30 dB)

Constants

T_0= 290K

Results

Equivalent Noise Temperature (T_e)
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📖 Example: LNA Noise Performance

Find noise temperature of a 1 dB noise figure LNA

Related Formulas

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Thermal Noise Power

Johnson-Nyquist noise power in a bandwidth

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Friis Cascade Noise Formula

Calculate total noise figure of cascaded amplifiers

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Friis Transmission Equation

Calculate received power given transmit power and antenna gains