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Noise Figure Formula

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Noise Figure of Amplifier is a parameter that quantifies how much additional noise the amplifier adds to the signal passing through it. Check FAQs

F = \frac{SN m}{SN out}

F - Noise Figure of Amplifier?SN_m - Maximum Possible S/N Ratio?SN_out - Actual S/N Ratio at Output?

Noise Figure Example

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Here is how the Noise Figure equation looks like with Values.

Here is how the Noise Figure equation looks like with Units.

Here is how the Noise Figure equation looks like.

13 = \frac{390}{30}

13dB = \frac{390dB}{30dB}

13 = \frac{390}{30}

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Noise Figure Solution

Follow our step by step solution on how to calculate Noise Figure?

FIRST Step Consider the formula

F = \frac{SN m}{SN out}

Next Step Substitute values of Variables

∴

F = \frac{390dB}{30dB}

Next Step Prepare to Evaluate

∴

F = \frac{390}{30}

LAST Step Evaluate

∴

F = 13dB

Noise Figure Formula Elements

Variables

Noise Figure of Amplifier

Noise Figure of Amplifier is a parameter that quantifies how much additional noise the amplifier adds to the signal passing through it.

Symbol: F

Measurement: NoiseUnit: dB

Note: Value can be positive or negative.

Formulas to find Noise Figure of Amplifier

Maximum Possible S/N Ratio

Maximum Possible S/N Ratio is defined as a measure used in science and engineering that compares the level of the desired signal to the level of background noise.

Symbol: SN_m

Measurement: NoiseUnit: dB

Note: Value can be positive or negative.

Formulas to find Maximum Possible S/N Ratio

Actual S/N Ratio at Output

Actual S/N ratio at Output can be calculated tf your signal and noise measurements are already in dB form, simply subtract the noise figure from the main signal.

Symbol: SN_out

Measurement: NoiseUnit: dB

Note: Value can be positive or negative.

Formulas to find Actual S/N Ratio at Output

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How to Evaluate Noise Figure?

Noise Figure evaluator uses Noise Figure of Amplifier = Maximum Possible S/N Ratio/Actual S/N Ratio at Output to evaluate the Noise Figure of Amplifier, The Noise Figure formula is defined as the noise figure is the difference in decibels (dB) between the noise output of the actual receiver to the noise output of an “ideal” receiver with the same overall gain and bandwidth when the receivers are connected to matched sources at the standard noise temperature. Noise Figure of Amplifier is denoted by F symbol.

How to evaluate Noise Figure using this online evaluator? To use this online evaluator for Noise Figure, enter Maximum Possible S/N Ratio (SN_m) & Actual S/N Ratio at Output (SN_out) and hit the calculate button.

FAQs on Noise Figure

What is the formula to find Noise Figure?

The formula of Noise Figure is expressed as Noise Figure of Amplifier = Maximum Possible S/N Ratio/Actual S/N Ratio at Output. Here is an example- 13 = 390/30.

How to calculate Noise Figure?

With Maximum Possible S/N Ratio (SN_m) & Actual S/N Ratio at Output (SN_out) we can find Noise Figure using the formula - Noise Figure of Amplifier = Maximum Possible S/N Ratio/Actual S/N Ratio at Output.

Can the Noise Figure be negative?

Yes, the Noise Figure, measured in Noise can be negative.

Which unit is used to measure Noise Figure?

Noise Figure is usually measured using the Decibel[dB] for Noise. Neper[dB], MilliDecibel[dB] are the few other units in which Noise Figure can be measured.

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Noise Figure Formula

Noise Figure Example

Noise Figure Solution

Noise Figure Formula Elements

Other formulas in Mobile Radio Propogation category

How to Evaluate Noise Figure?

FAQs on Noise Figure

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