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Electrothermal Simulation<br />

Specifying an Electrothermal Simulation<br />

Figure 16-1. Electrothermal Simulation Flow<br />

Related Topics<br />

Specifying an Electrothermal Simulation<br />

Electrothermal Simulation Example<br />

Specifying an Electrothermal Simulation<br />

The implementation of electrothermal simulation in Eldo is subcircuit-based.<br />

You specify the .TEMPNODE command inside the subcircuit for which the<br />

electrothermal effect is to be monitored. This is the internal definition syntax. The voltage value<br />

on the specified node represents the temperature increase of the corresponding subcircuit with<br />

respect to the global circuit temperature. Eldo computes the power dissipated by the active<br />

devices present in the subcircuit containing .TEMPNODE commands. This power, formally<br />

equivalent to a current source, is dissipated in the thermal network attached to the thermal net,<br />

resulting in a new temperature value of the subcircuit. Eldo continues iterations until<br />

convergence is achieved.<br />

Examples of Setting up Electrothermal Simulation<br />

For example, starting from a normal subcircuit:<br />

.subcircuit mybjt c b e<br />

.model bjt50 bjt level=…<br />

Q1 c b e bjt50<br />

.ends<br />

Enable electrothermal simulation with the following simple addition (th node on subcircuit and<br />

.TEMPNODE command):<br />

716<br />

Eldo® User's Manual, 15.3

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