Amplifier
A complex main bandwidth amplifier model with noise and nonlinearities.
Description
The Amplifier block is a comprehensive main band amplifier model with thermal noise. This block includes four nonlinearity models and three options for specifying the noise representation.
Ports
Input
#
In
—
baseband signal
real scalar | real column | complex scalar | complex column
Details
A baseband signal specified as a real scalar or column, complex scalar or column.
| Data types |
|
| Complex numbers support |
Yes |
Output
#
Out
—
baseband signal
real scalar | real column | complex scalar | complex column
Details
A baseband signal specified as a real scalar or column, complex scalar or column. The output signal has the same data type as the input signal.
For example, if the input signal is specified as a real scalar with data type Float64, the output signal is also specified as a real signal with data type Float64.
| Data types |
|
| Complex numbers support |
Yes |
Parameters
Main
#
Model —
amplifier nonlinearity model
cubic | ampm | modified-rapp | saleh
Details
A model of the nonlinearity of an amplifier. Defined as:
-
cubic- uses the linear power gain to determine the linear coefficient of the third-order polynomial and either IP3, P1dB, or Psat to determine the coefficient of the third-order polynomial. -
ampm- uses a lookup table to calculate the power characteristics of the amplifier. -
modified-rapp- uses a normalised transfer function to calculate the power characteristics of the amplifier. -
saleh- uses a normalised transfer function to calculate the power characteristics of the amplifier.
| Values |
|
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
No |
#
Linear power gain (dB) —
linear amplifier gain
Real number
Details
The linear gain specified as a scalar.
Dependencies
To use this parameter, set the Model parameters to cubic or modified-rapp.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Type of Non-linearity —
third-order nonlinearity type
IIP3 | OIP3 | IP1dB | OP1dB | IPsat | OPsat
Details
Third-order nonlinearity type, specified as IIP3, OIP3, IP1dB, OP1dB, IPsat or OPsat.
| Values |
|
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
No |
#
Input third-order intercept point (dBm) —
third-order intercept input point
Real number
Details
The input point of a third-order intercept specified as a positive real number.
Dependencies
To use this parameter, set the Model parameters to cubic and the Type of Non-Linearity to IIP3.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Output third-order intercept point (dBm) —
third-order intercept output point
Real number
Details
The output point of a third-order intercept specified as a positive real number.
Dependencies
To use this parameter, set the Model parameters to cubic and the Type of Non-Linearity to OIP3.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Input 1 dB compression point (dBm) —
input compression point 1 dB
Real number
Details
1 dB input compression point specified as a positive real number.
Dependencies
To use this parameter, set the Model parameters to cubic and the Type of Non-Linearity to IP1dB.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Output 1 dB compression point (dBm) —
output compression point 1 dB
Real number
Details
1 dB compression output point specified as a positive real number.
Dependencies
To use this parameter, set the Model parameters to cubic and the Type of Non-Linearity to OP1dB.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Input saturation point (dBm) —
input saturation point
Real number
Details
The saturation point of the input signal, specified as a positive real number.
Dependencies
To use this parameter, set the Model parameters to cubic and the Type of Non-Linearity to IPsat.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Output saturation point (dBm) —
output saturation point
Real number
Details
The saturation point of the output signal, set as a positive real number.
Dependencies
To use this parameter, set the Model parameters to cubic and the Type of Non-Linearity to OPsat.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Lookup table (Pin(dBm), Pout(dBm), deg) —
search table
Matrix of real numbers
Details
Lookup table values given as a real matrix at . This table expresses the model output power level in dBm in the 2nd column of the matrix and the model phase change in degrees in the 3rd column of the matrix as a function of the absolute value of the input signal power in the 1st column of the matrix for the AM/AM - AM/PM model. The power of the input signal in 1 column should monotonically increase.
The interp1 function with linear method is used to extrapolate and interpolate the data points specified in the lookup table. In addition, the slope of function 1 and a constant phase value equal to the phase of the lowest input power specified in the lookup table are used in AM/AM extrapolation to extrapolate input data points that are less than the lowest input power value specified in the lookup table.
Dependencies
To use this parameter, set the Model parameter to ampm.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Linear power gain (dB) —
description missing
Real number
Details
Description missing.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Output saturation level (V) —
output saturation level
Real number
Details
The saturation level of the output voltage, set as a positive real number.
Dependencies
To use this parameter, set the Model parameter to modified-rapp.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Magnitude smoothness factor —
magnitude smoothing factor
Real number
Details
Magnitude smoothing factor for modified-rapp AM/AM model calculations, specified as a positive real number.
Dependencies
To use this parameter, set the Model parameter to modified-rapp.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Phase gain (rad) —
phase gain
Real number
Details
The phase gain for AM/PM model calculations is specified as a real scalar in radians.
Dependencies
To use this parameter, set the Model parameter to modified-rapp.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Phase saturation —
phase saturation
Real number
Details
Phase saturation for AM/PM calculations of the modified-rapp model, set as a positive real number.
Dependencies
To use this parameter, set the Model parameter to modified-rapp.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Phase smoothness factor —
phase smoothing factor
Scalar / matrix of real numbers
Details
The phase smoothing coefficient for modified-rapp AM/PM model calculations, specified as a positive real number or a vector of two tuples.
Dependencies
To use this parameter, set the Model parameter to modified-rapp.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Input scaling (dB) —
input signal level scaling factor
Real number
Details
The input signal level scaling factor for the saleh model, set as a non-negative real number.
Dependencies
To use this parameter, set the Model parameter to saleh.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
AM/AM parameters [alpha beta] —
AM/AM conversion parameters
Matrix of real numbers
Details
The parameters of the AM/AM transformation into two tuples for the saleh model, are given as a two-element vector of non-negative real numbers.
Dependencies
To use this parameter, set the Model parameter to saleh.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
AM/PM parameters [alpha beta] —
AM/FM conversion parameters
Matrix of real numbers
Details
The parameters of AM/FM conversion into two tuples for saleh model, are set as a two-element vector of non-negative real numbers.
Dependencies
To use this parameter, set the Model parameter to saleh.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Output scaling (dB) —
output level scaling factor
Real number
Details
The output level scaling factor for the saleh model, set as a non-negative real number.
Dependencies
To use this parameter, set the Model parameter to saleh.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
Основные
#
Include noise —
noise activation
Logical
Details
Select this check box to add system noise to the input signal. Once selected, the parameters associated with the Noise tab are displayed.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
No |
#
Specify noise type —
noise type
noise-temperature | NF | noise-factor
Details
Noise type, set as:
-
noise-temperature- noise temperature. -
NF- noise figure. -
noise-factor- noise factor.
Dependencies
To use this parameter, tick the Include noise parameters checkbox.
| Values |
|
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
No |
#
Noise temperature (K) —
amplifier noise temperature
Real number
Details
The noise temperature for modelling noise in an amplifier, set as a non-negative real number.
Dependencies
To use this parameter, check the Include Noise parameters and set Specify noise type to noise-temperature.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
NF (dB) —
amplifier noise figure
Real number
Details
The noise figure for modelling noise in an amplifier, specified as a non-negative real number.
Dependencies
To use this parameter, check the Include Noise parameters and set Specify noise type to NF.
Dependencies
To use this parameter, select the Include noise parameter check box.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Noise factor —
amplifier noise figure
Real number
Details
The noise figure for modelling noise in an amplifier, is given as a positive integer scalar, .
Dependencies
To use this parameter, check the Include Noise parameters and set Specify noise type to noise-factor.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Seed source —
initial value source
auto | user
Details
The initial value source used to prepare the Gaussian random number noise generator. Defined as:
-
auto- the source for each amplifier is generated using a random number generator. The instance reset method has no effect. -
user- the value specified in Seed is used to initialise the random number generator, and the reset method resets the random number generator using the value of the Seed property.
Dependencies
To use this parameter, check the Include Noise parameters checkbox.
| Values |
|
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
No |
#
Seed —
initial value of the random number generator
Real number
Details
The initial value for the random number generator, specified as a non-negative integer, is . Use this value to initialise the random number generator.
Dependencies
To use this parameter, check the Include Noise parameters and set Seed source to user.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
Literature
-
Razavi, Behzad. "Basic Concepts in RF Microelectronics.", 2nd edition, Prentice Hall, 2012.
-
Rapp, C., "Effects of HPA-Nonlinearity on a 4-DPSK/OFDM-Signal for a Digital Sound Broadcasting System." Proceedings of the Second European Conference on Satellite Communications, Liege, Belgium, Oct. 22-24, 1991, pp. 179-184.
-
Saleh, A.A.M., "Frequency-independent and frequency-dependent nonlinear models of TWT amplifiers." IEEE Trans. Communications, vol. COM-29, pp.1715-1720, November 1981.
-
IEEE 802.11-09/0296r16. "TGad Evaluation Methodology." Institute of Electrical and Electronics Engineers.https://www.ieee.org/
-
Kundert, Ken. "Accurate and Rapid Measurement of IP2 and IP3," The Designer Guide Community, May 22, 2002.