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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Elements

Amplifier	Model amplifier in RF systems
Mixer	Model mixer in RF systems
IMT Mixer	Model mixer using intermodulation table (IMT)
Power Amplifier	Model power amplifier with memory
VGA	Model variable gain amplifier

Testbenches

OIP3 Testbench	Measure output third intercept point of system
IIP3 Testbench	Measure input third intercept point of system
OIP2 Testbench	Measure output second intercept point of system
IIP2 Testbench	Measure input second intercept point of system

Systems

IQ Demodulator	Convert RF signal to baseband signal
IQ Modulator	Convert baseband signal to RF signal
Modulator	Model RF to RF modulator
Demodulator	Model RF to RF demodulator

Topics

RF Noise and Nonlinearity Simulations
Simulate RF noise and nonlinearities.
Carrier to Interference Performance of Weaver Receiver
A classic superheterodyne architecture filters images prior to frequency conversion.
Measuring Image Rejection Ratio in Receivers
Calculate the image rejection ratio for high-side-injection in Weaver and Hartley receivers.

Related Information

Power Amplifier Modeling and DPD Design with MATLAB

Featured Examples

Power Amplifier Characterization

Characterize a power amplifier (PA) using measured input and output signals of an NXP Airfast PA. Optionally, you can use a hardware test setup including an NI PXI chassis with a vector signal transceiver (VST) to measure the signals at run time.

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Power Amplifier and DPD Modeling for Dynamic EVM Measurement

Extract a PA model using measured data, verify the quality of the fitting, and simulate the PA model with and without DPD.

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Digital Predistortion to Compensate for Power Amplifier Nonlinearities

Use digital predistortion in a transmitter to offset the effects of nonlinearities in a power amplifier.

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Validating IP2/IP3 Using Complex Signals

Run a two-tone experiment to measure the second- and third-order intercept points of an amplifier.

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Two-Tone Envelope Analysis Using Real Signals

Test intermodulation distortion of an amplifier using two-carrier envelope analysis.

Open Script