Chapter 4
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Bipolar Junction Transistor
- NPN: Not Pointing iN
- PNP: Pointing iN Please
- The arrow is for the emitter current. For an NPN the current flows into the collector. For a PNP the current flows out of the collector.
How a BJT works
Large-Signal DC models
| Base-Emitter | Collector-Emitter | Region |
|---|---|---|
| FB | FB | Saturation |
| FB | RB | Active |
| RB | FB | Reverse Active |
| RB | RB | Cutoff |
 |
 |
- What are the Saturation, Reverse Active and Cutoff regions used for?
- Why do we always seem to use a common emitter configuration?
- What does the Reverse Active large-signal model look like? How about graphically?
- What is the Triode region?
- For the Saturation region, why is 0.2V the magic number for V_CE?