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Noise Figure of Low Noise Amplifier Formula

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Noise Figure is a measure of how much noise the amplifier adds to the signal it is amplifying. Check FAQs

NF = 1 + (\frac{4 \cdot R s}{R f}) + γ

NF - Noise Figure?R_s - Source Impedance?R_f - Feedback Resistance?γ - Noise Factor of Transistor?

Noise Figure of Low Noise Amplifier Example

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

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

Here is how the Noise Figure of Low Noise Amplifier equation looks like.

14.8286 = 1 + (\frac{4 \cdot 23}{35}) + 11.2

14.8286dB = 1 + (\frac{4 \cdot 23Ω}{35Ω}) + 11.2

14.8286 = 1 + (\frac{4 \cdot 23}{35}) + 11.2

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Noise Figure of Low Noise Amplifier Solution

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

FIRST Step Consider the formula

NF = 1 + (\frac{4 \cdot R s}{R f}) + γ

Next Step Substitute values of Variables

∴

NF = 1 + (\frac{4 \cdot 23Ω}{35Ω}) + 11.2

Next Step Prepare to Evaluate

∴

NF = 1 + (\frac{4 \cdot 23}{35}) + 11.2

Next Step Evaluate

∴

NF = 14.8285714285714dB

LAST Step Rounding Answer

∴

NF = 14.8286dB

Noise Figure of Low Noise Amplifier Formula Elements

Variables

Noise Figure

Noise Figure is a measure of how much noise the amplifier adds to the signal it is amplifying.

Symbol: NF

Measurement: NoiseUnit: dB

Note: Value should be greater than 0.

Formulas to find Noise Figure

Source Impedance

Source Impedance is the opposition to current flow that the source presents to the load.

Symbol: R_s

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Source Impedance

Feedback Resistance

Feedback Resistance is a resistance that is connected between the output of the amplifier and the input of the amplifier.

Symbol: R_f

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Feedback Resistance

Noise Factor of Transistor

Noise Factor of Transistor is a measure of how much noise the transistor itself adds to the signal.

Symbol: γ

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Noise Factor of Transistor

Other formulas in RF Microelectronics category

Go Return Loss of Low-Noise Amplifier

Γ = mod \underset{̲}{u} s {(\frac{Z in - R s}{Z in + R s})}^{2}

Go Voltage Gain of Low Noise Amplifier

A v = g m \cdot R d

Go Voltage Gain of Low Noise Amplifier given DC Voltage Drop

A v = 2 \cdot \frac{V rd}{V gs - V th}

Go Output Impedance of Low Noise Amplifier

R out = (\frac{1}{2}) \cdot (R f + R s)

How to Evaluate Noise Figure of Low Noise Amplifier?

Noise Figure of Low Noise Amplifier evaluator uses Noise Figure = 1+((4*Source Impedance)/Feedback Resistance)+Noise Factor of Transistor to evaluate the Noise Figure, The Noise Figure of Low Noise Amplifier formula is defined as a measure of how much noise the amplifier adds to the signal it is amplifying. Noise Figure is denoted by NF symbol.

How to evaluate Noise Figure of Low Noise Amplifier using this online evaluator? To use this online evaluator for Noise Figure of Low Noise Amplifier, enter Source Impedance (R_s), Feedback Resistance (R_f) & Noise Factor of Transistor (γ) and hit the calculate button.

FAQs on Noise Figure of Low Noise Amplifier

What is the formula to find Noise Figure of Low Noise Amplifier?

The formula of Noise Figure of Low Noise Amplifier is expressed as Noise Figure = 1+((4*Source Impedance)/Feedback Resistance)+Noise Factor of Transistor. Here is an example- 14.82857 = 1+((4*23)/35)+11.2.

How to calculate Noise Figure of Low Noise Amplifier?

With Source Impedance (R_s), Feedback Resistance (R_f) & Noise Factor of Transistor (γ) we can find Noise Figure of Low Noise Amplifier using the formula - Noise Figure = 1+((4*Source Impedance)/Feedback Resistance)+Noise Factor of Transistor.

Can the Noise Figure of Low Noise Amplifier be negative?

No, the Noise Figure of Low Noise Amplifier, measured in Noise cannot be negative.

Which unit is used to measure Noise Figure of Low Noise Amplifier?

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

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Noise Figure of Low Noise Amplifier Formula

Noise Figure of Low Noise Amplifier Example

Noise Figure of Low Noise Amplifier Solution

Noise Figure of Low Noise Amplifier Formula Elements

Other formulas in RF Microelectronics category

How to Evaluate Noise Figure of Low Noise Amplifier?

FAQs on Noise Figure of Low Noise Amplifier

Variable Name