Noise

Model noise using current or voltage noise source in RF systems

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  • Library:

  • RF Blockset / Circuit Envelope / Sources

  • Noise block

Description

Use the Noise block to model noise as a ideal current or voltage source for blocks. When you use a Noise to simulate noise in an RF model, also select the Simulate noise check box in the Configuration block. Otherwise, the model simulates without noise. The Noise block does not depend on the Temperature parameter in the Configuration.

Parameters

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Noise type, specified as Ideal voltage or Ideal current.

Noise distribution type, specified as White, Piece-wise linear, or Colored.

Single-sided noise power spectral distribution (PSD), specified as:

  • White, spectral density is a single non-negative value. The power value of the noise depends on the bandwidth of the carrier and the bandwidth depends on the time step. This is an uncorrelated noise source.

  • Piece-wise linear, spectral density is a vector of values [pi]. For each carrier, the noise source behaves like a white uncorrelated noise. The power of the noise source is carrier-dependent.

  • Colored, depends on both carrier and bandwidth. This is a correlated noise source.

When Source type is set to:

  • Ideal voltage, spectral density units are V2/Hz.

  • Ideal Current, spectral density units are A2/Hz.

Frequencies for piece-wise linear noise distribution, specified as vector of non-negative frequencies.

Select this option to internally ground and hide the negative terminals. To expose the negative terminals, clear the option. By exposing these terminals, you can connect them to other parts of your model.

By default, this option is selected.

Model Examples

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.

See Also

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Introduced in R2010b

RF Blockset Documentation

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