Model noise using current or voltage noise source in RF systems
RF Blockset / Circuit Envelope / Sources
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.
Noise block mask icons are dynamic and show the current type of source. This table shows you how the icons on this block vary based on the type of source you set on the Source type parameter on the block.
|Source type: ||Source type: |
Source type— Noise type
Ideal voltage(default) |
Noise type, specified as
Ideal voltage or
Noise distribution— Noise distribution type
Noise distribution type, specified as
Noise power spectral density— Single-sided noise power spectral distribution (PSD)
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— Frequencies for piece-wise linear noise distribution
0 Hz(default) | vector of non-negative frequencies |
Frequencies for piece-wise linear noise distribution, specified as vector of non-negative frequencies.
Ground and hide negative terminals— Ground RF circuit terminals
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.
Behavior changed in R2021b
Starting in R2021b, the Noise block icon is now updated. When you open a model created before R2021b containing a Noise block, the software replaces the block icon with the R2021b version.