# noisefigure

Calculate noise figure of transmission lines, series RLC, and shunt RLC circuits

Since R2020b

## Syntax

``nf = noisefigure(transmissionline,frequency,zs)``
``nf = noisefigure(RLCckt,frequency,zs)``

## Description

````nf = noisefigure(transmissionline,frequency,zs)` calculate the noise figure of transmission lines using the given frequency and source impedance.```

example

````nf = noisefigure(RLCckt,frequency,zs)` calculate the noise figure of series and shunt RLC circuits using the given frequency and source impedance. `RLCckt` is either `seriesRLC` or `shuntRLC` objects. ```

example

## Examples

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Create a two-wire transmission line using these specifications:

• Radius - 0.5 mm

• Dielectric - air

• Thickness of dielectric or separation - 1.088 mm

• Permittivity or `EpsilonR` - 1.0054

`twowiretxline = txlineTwoWire('Radius',0.5e-3,'EpsilonR',1.0054,'Separation',1.088e-3);`

Calculate the noise figure and the group delay of the transmission line at 2.5 GHz.

`nf = noisefigure(twowiretxline,2.5e9)`
```nf = 0 ```
`gd = groupdelay(twowiretxline,2.5e9)`
```gd = 3.3446e-11 ```

## Input Arguments

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Series or shunt RLC circuit objects, specified as a `seriesRLC` or `shuntRLC` objects.

Frequency to calculate noise figure, specified as a positive scalar in hertz.

Source impedance, specified as a positive real scalar in ohms.

## Version History

Introduced in R2020b

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