Doc ID 023670 Rev 1

9/24

UM1575

A brief description of self-heating model (V3 version)

24

4.1

Thermal network

Thermal impedance network represents the basic element, which is featured inside the

macro-model. It is used to transform the power dissipated inside the junction into a voltage

representing the temperature (T

j

).

Figure 6. Physical structure

The voltage drop across the network is detected and used as emitter value inside behavioral

equations used to model other parameters.

Thermal impedance is the experimental data required to obtain the Cauer model (see

Figure 6).

Figure 7. Thermal impedance profile and Cauer model