Noise Factor Calculator

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Analog Noise and Power Analysis

Amplitude Modulation Characteristics

DSBSC Modulation

Frequency Modulation

Fundamentals of Analog Communications

Sideband and Frequency Modulation

✖Signal Power at Input refers to the amount of energy present in the input signal. It is typically measured in decibels and is a crucial parameter in signal processing and communication systems.ⓘ Signal Power at Input [P_si]			+10% -10%
✖The Noise Power at Output is defined as spurious contributions from image-frequency transformation.ⓘ Noise Power at Output [P_no]			+10% -10%
✖Signal Power at Output refers to the amount of energy present in the input signal. It is typically measured in decibels and is a crucial parameter in signal processing and communication systems.ⓘ Signal Power at Output [P_so]			+10% -10%
✖The Noise Power at Input is defined as the noise originating on the source resistance feeding the receiver.ⓘ Noise Power at Input [P_ni]			+10% -10%

✖The Noise Factor is defined as the measure of degradation of the signal to noise ratio in a device.ⓘ Noise Factor [N_f]

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Formula

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Noise Factor

Formula

`"N"_{"f"} = ("P"_{"si"}*"P"_{"no"})/("P"_{"so"}*"P"_{"ni"})`

Example

`"2.222222"=("25W"*"24W")/("15W"*"18W")`

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Noise Factor Solution

STEP 0: Pre-Calculation Summary

Formula Used

Noise Factor = (Signal Power at Input*Noise Power at Output)/(Signal Power at Output*Noise Power at Input)
N_f = (P_si*P_no)/(P_so*P_ni)
This formula uses 5 Variables

Variables Used

Noise Factor - The Noise Factor is defined as the measure of degradation of the signal to noise ratio in a device.
Signal Power at Input - (Measured in Watt) - Signal Power at Input refers to the amount of energy present in the input signal. It is typically measured in decibels and is a crucial parameter in signal processing and communication systems.
Noise Power at Output - (Measured in Watt) - The Noise Power at Output is defined as spurious contributions from image-frequency transformation.
Signal Power at Output - (Measured in Watt) - Signal Power at Output refers to the amount of energy present in the input signal. It is typically measured in decibels and is a crucial parameter in signal processing and communication systems.
Noise Power at Input - (Measured in Watt) - The Noise Power at Input is defined as the noise originating on the source resistance feeding the receiver.

STEP 1: Convert Input(s) to Base Unit

Signal Power at Input: 25 Watt --> 25 Watt No Conversion Required
Noise Power at Output: 24 Watt --> 24 Watt No Conversion Required
Signal Power at Output: 15 Watt --> 15 Watt No Conversion Required
Noise Power at Input: 18 Watt --> 18 Watt No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

N_f = (P_si*P_no)/(P_so*P_ni) --> (25*24)/(15*18)

Evaluating ... ...

N_f = 2.22222222222222

STEP 3: Convert Result to Output's Unit

2.22222222222222 --> No Conversion Required

FINAL ANSWER

2.22222222222222 ≈ 2.222222 <-- Noise Factor

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electronics » Analog Communications » Analog Noise and Power Analysis » Noise Factor

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Created by Pranav Simha R

BMS College of Engineering (BMSCE), Bangalore,India

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BMS College Of Engineering (BMSCE), Banglore

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< 14 Analog Noise and Power Analysis Calculators

SNR for AM Demodulation

Go SNR of AM System = ((Modulation Index^2*Amplitude of Message Signal)/(1+Modulation Index^2*Amplitude of Message Signal))*Signal to Noise Ratio

Mean Square Value of Shot Noise

Go Mean Square Shot Noise Current = sqrt(2*(Total Current+Reverse Saturation Current)*[Charge-e]*Effective Noise Bandwidth)

RMS Thermal Noise Current

Go RMS Thermal Noise Current = sqrt(4*[BoltZ]*Temperature*Conductance*Noise Bandwidth)

RMS Noise Voltage

Go RMS Noise Voltage = sqrt(4*[BoltZ]*Temperature *Noise Bandwidth*Noise Resistance)

Noise Factor

Go Noise Factor = (Signal Power at Input*Noise Power at Output)/(Signal Power at Output*Noise Power at Input)

SNR for PM System

Go SNR of PM System = Phase Deviation Constant^2*Amplitude of Message Signal*Signal to Noise Ratio

SNR for FM System

Go SNR of FM System = 3*Deviation Ratio^2*Amplitude of Message Signal*Signal to Noise Ratio

Power Density Spectrum of Thermal Noise

Go Power Spectral Density of Thermal Noise = 2*[BoltZ]*Temperature*Noise Resistance

Noise Power at Output of Amplifier

Go Noise Power at Output = Noise Power at Input*Noise Factor*Noise Power Gain

Thermal Noise Power

Go Thermal Noise Power = [BoltZ]*Temperature*Noise Bandwidth

Output SNR

Go Signal to Noise Ratio = log10(Signal Power/Noise Power)

Power Spectral Density of White Noise

Go Power Spectral Density of White Noise = [BoltZ]*Temperature/2

Noise Power Gain

Go Noise Power Gain = Signal Power at Output/Signal Power at Input

Equivalent Noise Temperature

Go Temperature = (Noise Factor-1)*Room Temperature

Noise Factor Formula

Noise Factor = (Signal Power at Input*Noise Power at Output)/(Signal Power at Output*Noise Power at Input)
N_f = (P_si*P_no)/(P_so*P_ni)

What are applications of calculating Noise Factor?

Calculating Noise Factor is crucial in designing low-noise amplifiers in communication systems, radio receivers, and sensitive instrumentation. It aids in optimizing signal-to-noise ratio, determining noise contributions in electronic components, and ensuring minimal noise interference, vital for high-fidelity audio systems, wireless communications, and sensitive scientific instruments.

How to Calculate Noise Factor?

Noise Factor calculator uses Noise Factor = (Signal Power at Input*Noise Power at Output)/(Signal Power at Output*Noise Power at Input) to calculate the Noise Factor, Noise Factor is the measure of degradation of the signal to noise ratio in a device. It is the ratio of the Signal to Noise Ratio at the input to the Signal to Noise Ratio at the output. Noise Factor is denoted by N_f symbol.

How to calculate Noise Factor using this online calculator? To use this online calculator for Noise Factor, enter Signal Power at Input (P_si), Noise Power at Output (P_no), Signal Power at Output (P_so) & Noise Power at Input (P_ni) and hit the calculate button. Here is how the Noise Factor calculation can be explained with given input values -> 2.222222 = (25*24)/(15*18).

FAQ

What is Noise Factor?

Noise Factor is the measure of degradation of the signal to noise ratio in a device. It is the ratio of the Signal to Noise Ratio at the input to the Signal to Noise Ratio at the output and is represented as N_f = (P_si*P_no)/(P_so*P_ni) or Noise Factor = (Signal Power at Input*Noise Power at Output)/(Signal Power at Output*Noise Power at Input). Signal Power at Input refers to the amount of energy present in the input signal. It is typically measured in decibels and is a crucial parameter in signal processing and communication systems, The Noise Power at Output is defined as spurious contributions from image-frequency transformation, Signal Power at Output refers to the amount of energy present in the input signal. It is typically measured in decibels and is a crucial parameter in signal processing and communication systems & The Noise Power at Input is defined as the noise originating on the source resistance feeding the receiver.

How to calculate Noise Factor?

Noise Factor is the measure of degradation of the signal to noise ratio in a device. It is the ratio of the Signal to Noise Ratio at the input to the Signal to Noise Ratio at the output is calculated using Noise Factor = (Signal Power at Input*Noise Power at Output)/(Signal Power at Output*Noise Power at Input). To calculate Noise Factor, you need Signal Power at Input (P_si), Noise Power at Output (P_no), Signal Power at Output (P_so) & Noise Power at Input (P_ni). With our tool, you need to enter the respective value for Signal Power at Input, Noise Power at Output, Signal Power at Output & Noise Power at Input and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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