The name of this electronic device is derived from it’s fundamental action transfer resistor.
Working of transistor
There are four possible ways of biasing the two P-N junctions (emitter junction and collector junction) of transistor.
- Active mode: Also known as linear mode operation.
- Saturation mode: Maximum collector current flows and transistor acts as a closed switch from collector to emitter terminals.
- Cut-off mode: Denotes operation like an open switch where only leakage current flows.
- Inverse mode: The emitter and collector are inter changed.
| Operating mode | Emitter base bias | Collector base bias |
|---|---|---|
| Active | Forward | Reverse |
| Saturation | Forward | Forward |
| Cut off | Reverse | Reverse |
| Inverse | Reverse | Forward |
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