Created By : Vaibhavi Kumari

Reviewed By : Rajashekhar Valipishetty

Last Updated : May 17, 2023

Make use of the noise temperature calculator is calculating the source noise temperature in a two-port network or amplifier that will result in the same output noise power when connected to a noise-free network or amplifier as the actual network or amplifier connected to a noise-free source when connected to a noise-free source.

### Effective Noise Temperature Definition and Formula

The effective noise temperature is defined as the temperature of the resistor at which the noise power is equal to the circuit or device's.In the telecommunications industry, the effective noise temperature is commonly utilised.

The formula T = N/kBcan be used to compute the effective noise temperature.

Where,

• N denotes the amount of noise inside a given bandwidth.
• B is the bandwidth
• K is the Boltzmann constant, which is approximately equal to 1.38*10 -23 JK -1

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### Noise Factor and Noise Figure

The terms noise factor and noise figure are fairly self-explanatory: they refer to the noise that a component, such as an amplifier, adds to the input signal as it travels through to the output, or that is generated by thermal motion within a passive component. Entropy, device and material physics, random electron mobility, and numerous defects, to name a few factors, are all sources of this inescapable, internally generated noise.

The noise factor (F) has a simple quantitative definition: it is the ratio of the input signal-to-noise ratio (SNR) to the output SNR:

Noise Factor (F) = (Input Signal/Input Noise)/(Output Signal/Output Noise).

### What is the Effective Noise Temperature Calculator and How do I use it?

The following is how to use the effective noise temperature calculator:

• Enter the temperature or bandwidth of noise in the appropriate field.
• To obtain the effective noise temperature, click the Calculate button.
• Finally, The effective noise temperature will be displayed in the new window.

### FAQs on Effective Noise Temperature Calculator

1. What about  noise temperature of an amplifier?

The temperature of a resistance that would produce the same noise power at the output of an ideal (noise-free) amplifier as that provided by the real amplifier when its input is terminated with a noise-free resistance is known as the noise temperature of an amplifier.

2. What is the relationship between noise temperature and noise figure?
The noise figure number which is expressed in decibels (dB), shows the performance of an amplifier or an RF receiver. The temperature necessary to produce an equivalent amount of Johnson-Nyquist Noise is referred to as the noise temperature.

3. What is the formula for effective noise temperature?

The formula T = N/kBcan be used to compute the effective noise temperature.
Where,

• N denotes the amount of noise inside a given bandwidth.
• B is the bandwidth
• K is the Boltzmann constant, which is approximately equal to 1.38*10 -23 JK -1