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Noise Figure and Noise Temperature Calculator

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Noise Figure and Noise Temperature Calculator
K
Please enter valid values. Reference temperature must be greater than 0 K.
RESULTS
NOISE TEMPERATURE
K
NOISE FIGURE
dB

Noise Figure and Noise Temperature Diagram

Input Signal + Noise RF Device Adds Internal Noise Output More Noise NF ↔ Noise Temperature Noise Figure shows how much noise a device adds

Formulas

Noise Temperature = Reference Temperature × (10^(Noise Figure / 10) - 1)
Noise Figure = 10 × log10((Noise Temperature / Reference Temperature) + 1)

Diagrams & Theory

Noise figure describes how much extra noise an RF device adds to a signal path. Lower noise figure means better receiver sensitivity and cleaner signal performance.

Noise temperature is another way to express the same noise contribution, commonly used in RF receiver, antenna, and microwave system calculations.

Example

Input Example

Noise Figure: 1.5 dB
Reference Temperature: 290 K

How to Use

Select NF dB to calculate noise temperature, or select Temp K to convert noise temperature back to noise figure.

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About this tool

Noise Figure and Noise Temperature Calculator is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.