# General Amplifier

Model nonlinear amplifier described by object or file data

• Library:
• RF Blockset / Equivalent Baseband / Amplifiers

## Description

The General Amplifier block models the nonlinear amplifier described by a data source. The data source consists of either an RF Toolbox™ data (`rfdata.data`) object or data from a file.

## Parameters

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### Main

Data source that describes the amplifier behavior, specified as a `Data file` or an `RFDATA` object.

Name of file that contains the amplifier data, specified as a string or a character vector. The file name must include the extension. If the file is not in your MATLAB® path, specify the full path to the file or click the button to find the file.

#### Dependencies

To enable this parameter, choose ```Data file``` in Data source.

RF data object that contains the amplifier data, specified as an RF Toolbox `rfdata.data` object, an RF toolbox command that creates the `rfdata.data` object, or a MATLAB expression that generates such an object.

Method to interpolate the network parameters, specified as one of the following:

MethodDescription
`Linear`Linear interpolation
`Spline`Cubic spline interpolation
`Cubic`Piecewise cubic Hermite interpolation

### Noise Data

Type of noise data, specified as one of the following:

• `Noise figure`

• `Spot noise data`

• `Noise factor`

• `Noise temperature`

This parameter is disabled if the data source contains noise data.

Available signal-to-noise ratio at the input to available signal-to-noise ratio at the output, specified as a scalar ratio or a vector of ratios.

#### Dependencies

To enable this parameter, select `Noise figure` in Noise type.

Minimum ratio of available signal-to-noise ratio at the input to available signal-to-noise ratio at the output, specified as a scalar ratio or a vector of ratios.

#### Dependencies

To enable this parameter, select `Spot noise data` in Noise type.

Optimal source impedance, specified as a complex scalar or a complex vector.

#### Dependencies

To enable this parameter, select `Spot noise data` in Noise type.

Normalized resistance values used to take noise measurement, specified as a positive scalar or a positive vector.

#### Dependencies

To enable this parameter, select `Spot noise data` in Noise type.

Ratio of available signal-to-noise power at the input to available signal-to-noise power at the output, specified as a scalar ratio or a vector of ratios.

#### Dependencies

To enable this parameter, select `Noise factor` in Noise type.

Equivalent temperature that produces the same amount of noise as the amplifier, specified as a nonnegative scalar in kelvins or nonnegative vector with each element unit in kelvins.

#### Dependencies

To enable this parameter, select `Noise temperature` in Noise type.

Domain of frequencies to express noise data, specified as a nonnegative scalar in hertz or nonnegative vector with each element unit in hertz. If you provide a scalar value for your noise data, the block ignores the Frequency (Hz) parameter and uses the same noise data for all frequencies. If you provide a vector of values for your noise data, it must be the same size as the vector of frequencies. The block uses the Interpolation method specified in the Main tab to interpolate noise data.

### Nonlinearity Data

Type of third order intercept, specified as `OIP3` (output intercept point) or `IIP3` (input intercept point). This parameter is disabled if the data source contains power data or IP3 data.

IP3 value, specified as a scalar in dBm for frequency independent nonlinear data or a vector with each element unit in dBm for frequency dependent nonlinear data. This parameter is disabled if the data source contains power data or IP3 data.

Output power value (${P}_{1dB,out}$) at which the gain has decreased by 1 dB, specified as a scalar in dBm for frequency independent nonlinear data or vector with each element unit in dBm for frequency dependent nonlinear data. This parameter is disabled if the data source contains power data or IP3 data.

Output power value (${P}_{sat,out}$) that the amplifier produces when fully saturated, specified as a scalar in dBm for frequency independent nonlinear data or a vector with each element unit in dBm for frequency dependent nonlinear data. This parameter is disabled if the data source contains output saturation power data.

Decrease in gain value ($G{C}_{sat}$) when the power is fully saturated, specified as a scalar in dB for frequency independent nonlinear data or a vector with each element unit in dB for frequency dependent nonlinear data.

Frequency points corresponding to third-order intercept or power data, specified as a positive scalar or positive vector in units of hertz. This parameter is disabled if the data source contains power data or IP3 data.

#### Dependencies

• If you specify the frequency as a scalar, then the IP3 (dBm), 1 dB gain compression power (dBm), and Output saturation power (dBm) parameters must all be scalars.

• If you specify the frequency as a vector, then or more of the IP3 (dBm), 1 dB gain compression power (dBm), and Output saturation power (dBm) parameters must also be a vector.

### Visualization

Frequency data source, specified as ```Extracted from data source``` or `User-specified`.

Frequency data range, specified as a vector with each element unit in hertz.

Reference impedance, specified as a nonnegative scalar in ohms.

Type of data plot to visualize using the given data, specified as one of the following:

• `X-Y plane` — Generate a Cartesian plot of the data versus frequency. To create linear, semilog, or log-log plots, set the Y-axis scale and X-axis scale accordingly.

• `Composite data` — Plot the composite data.

• `Polar plane` — Generate a polar plot of the data. The block plots only the range of data corresponding to the specified frequencies.

• `Z smith chart`, ```Y smith chart```, and `ZY smith chart` — Generate a Smith® chart. The block plots only the range of data corresponding to the specified frequencies.

Type of S-Parameters to plot, specified as one of the following. When noise is spectral, `NF` plotting is possible.

 `S11` `S12` `S21` `S22` `GroupDelay` `GammaIn` `GammaOut` `VSWRIn` `VSWROut` `OIP3` `IIP3` `NF` `NFactor` `NTemp` `TF1` `TF2` `TF3` `Gt` `Ga` `Gp` `Gmag` `Gmsg` `GammaMS` `GammaML` `K` `Delta` `Mu` `MuPrime`

Type of S-Parameters to plot, specified as one of the following. When noise is spectral, `NF` plotting is possible.

 `S11` `S12` `S21` `S22` `GroupDelay` `GammaIn` `GammaOut` `VSWRIn` `VSWROut` `OIP3` `IIP3` `NF` `NFactor` `NTemp` `TF1` `TF2` `TF3` `Gt` `Ga` `Gp` `Gmag` `Gmsg` `GammaMS` `GammaML` `K` `Delta` `Mu` `MuPrime`

Plot format, specified as one of the following.

 `dB` `Magnitude (decibels)` `Abs` `Mag` `Magnitude (linear)` `Angle` `Angle(degrees)` `Angle(radians)` `Real` `Imag` `Imaginary`

Plot format, specified as one of the following.

 `dB` `Magnitude (decibels)` `Abs` `Mag` `Magnitude (linear)` `Angle` `Angle(degrees)` `Angle(radians)` `Real` `Imag` `Imaginary`

Frequency plot, specified as `Freq`.

Frequency plot format, specified as one of the following.

 `Auto` `Hz` `kHz` `MHz` `GHz` `THz`

Y-axis scale, specified as `Linear` or `Log`.

X-axis scale, specified as `Linear` or `Log`.

Plot specified data using the plot button.

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