Hi Emily,
RF blockset has specific RF blocks which has the required noise modelling. In other words, they do not have component level or device level models.
Explicit way for modelling the thermal noise of a resistor is shown in this document with an example where the current model is used to generate a noise current which is connected in parallel to the resistor. Refer to the documentation of the Noise block for more details.
The noise models for transistors can be implemented similarly by using the noise blocks for noise simulation of ideal transistors if required.
Kiran Felix Robert
