Unit B. Characterization of the Bipolar Junction Transistor for Circuit Simulation
The inclusion of transistors in circuit simulation requires a model for the transistor. That is, the simulator needs to know how the transistor behaves. Specifically, the simulator requires knowledge of the terminal characteristics of the transistor. For example, for a given dc voltage VBE applied between terminals B (base) and E (emitter), what will be the current into B (IB)? The mathematical relations are obtained from theory or experimental observation. Often, the theory is very complicated, but much more simple relations serve very well as good approximations.
| TABLE B.1 | ||
|---|---|---|
| SPICE Name | Math Symbol | Description |
| IS | IS | Description |
| ISE | ISE | Saturation current. |
| BF | βF | Base – emitter ... |
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