3. Background noise in simulators

Simulators calculate the noise at the input and output of a circuit. The result depends not only on the location of the noise source in the circuit ( § 3.2 "Quadrupole noise"), but also parameters introduced into the model quantifying local noise sources. Some of these parameters quantifying noise levels have default values, which the user will have to adjust to his component. Currently, only white noise and 1/f noise sources are included in component models. What's more, the variation in noise levels as a function of the voltage applied to the components is not necessarily the same between the different models and simulators available on the market. It is therefore important to master both the calculation principle applied by the simulator to a circuit and the noise in the components. The latter depends on the DC and AC parameters implemented.