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-6and frequency is
The Resistor noise source is modelled explicitly to make it noiseless. The resistance is 50 ohms. In the Resistor blocks, Simulate Noise is not selected.
The Noise current source is parallel to the Resistor block models the noise. In the Noise block, the Source type is set to Ideal current to make it a current source. The Noise spectral density is defined as 4kT/R in A^2/Hz. Where k is Boltzmann constant and T is temperature in kelvin.
The masked block, Calculate Noise Power, calculates the noise floor as a standard deviation of the output signal.
To run the model, select Simulation > Run . With the bandwidth included using the Configuration block, noise power is in the range of -173.98 to 174.1 dBm
Noise | S-Parameters | Configuration