Nonlinear Modeling

Nonlinear elements, nonlinear behavior, intermodulation distortion, IP2/IP3, interference

Use these blocks to specify the nonlinear behavior of amplifiers and mixers. Such behavior includes IP2/IP3, intermodulation distortion and 1-dB compression. You can also simulate frequency-dependent mismatches between components.

Blocks

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AmplifierModel amplifier in RF systems
MixerModel mixer in RF systems
IMT MixerModel mixer using intermodulation table (IMT)
Power AmplifierModel power amplifier with memory
VGAModel variable gain amplifier
OIP3 TestbenchMeasure output third intercept point of system
IIP3 TestbenchMeasure input third intercept point of system
OIP2 TestbenchMeasure output second intercept point of system
IIP2 TestbenchMeasure input second intercept point of system
IQ DemodulatorConvert RF signal to baseband signal
IQ ModulatorConvert baseband signal to RF signal
ModulatorModel RF to RF modulator
DemodulatorModel RF to RF demodulator

Topics

Carrier to Interference Performance of Weaver Receiver

A classic superheterodyne architecture filters images prior to frequency conversion.

Measuring Image Rejection Ratio in Receivers

This example shows how to use the RF Blockset™ Circuit Envelope library to calculate the image rejection ratio (IRR) for high-side-injection in Weaver and Hartley receivers.

Featured Examples

Validating IP2/IP3 Using Complex Signals

Validating IP2/IP3 Using Complex Signals

Use the RF Blockset™ Circuit Envelope library to run a two-tone experiment that measures the second- and third-order intercept points of an amplifier. The model computes the intercept points of the amplifier from the modulated signal power measured on each carrier, verifying the behavior of the RF Blockset system. These values are confirmed using the RF Budget Analyzer app and a measurement testbench.

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Two-Tone Envelope Analysis Using Real Signals

Two-Tone Envelope Analysis Using Real Signals

Use the RF Blockset™ Circuit Envelope library to test intermodulation distortion of an amplifier using two-carrier envelope analysis.

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Digital Predistortion to Compensate for Power Amplifier Nonlinearities

Digital Predistortion to Compensate for Power Amplifier Nonlinearities

This demo shows an example of using digital predistortion (DPD) in a transmitter to offset the effects of nonlinearities in a power amplifier. In this case, we use a model of a power amplifier that was obtained using the Power Amplifier Characterization (Communications Toolbox). In the first simulation, the RF transmitter sends two tones. In the second simulation, the RF transmitter sends a 5G-like OFDM waveform with 100 MHz bandwidth.

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RF Blockset Documentation

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