Noise Modeling

Noise sources, phase noise, thermal noise, noise figure specification

Use noise sources to simulate white or colored noise in RF models and calculate the noise power. To calculate thermal noise, use S-Parameters block.

Blocks

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AmplifierModel amplifier in RF systems
ResistorModel resistor for circuit envelope analysis
MixerModel mixer in RF systems
IMT MixerModel mixer using intermodulation table (IMT)
S-ParametersModel S-parameter network
Noise Figure TestbenchMeasures noise figure of system
NoiseModel noise using current or voltage noise source in RF systems
Continuous WaveModel constant envelope source
ConfigurationDefine system simulation settings

Topics

Model System Noise Figure

RF receivers amplify signals and shift them to lower frequencies.

Designing a Receiver with an ADC

Most RF receivers in modern communications or radar systems feed signals to an analog-to-digital converter (ADC).

Noise in RF Systems

Noise factor, noise figure, noise floor, thermal noise power, noise temperature, white noise, colored noise.

Featured Examples

RF Noise Modeling

RF Noise Modeling

Use the RF Blockset™ Circuit Envelope library to simulate noise and calculate noise power. Results are compared against theoretical calculations and a Communications Toolbox™ reference model.

Open Script
Model LO Phase Noise

Model LO Phase Noise

A mixer transfers local oscillator (LO) phase noise directly to its output.

Open Script
Spot Noise Data in Amplifiers and Effects on Measured Noise Figure

Spot Noise Data in Amplifiers and Effects on Measured Noise Figure

A test bench model to describe the noise introduced by a 2-port device.

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Explicitly Simulate Resistor Thermal Noise

Explicitly Simulate Resistor Thermal Noise

Use the Noise block to calculate the classic thermal noise floor, kT, for a matched resistor circuit. Model configuration is as follows: Time step of the model is 1e-6 and frequency is 2 GHz.

Open Script
Measurement of Gain and Noise Figure Spectrum

Measurement of Gain and Noise Figure Spectrum

Use RF Blockset to measure the Gain and Noise Figure of an RF system over a given spectral range.

Open Script

RF Blockset Documentation

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