Characteristics
At low frequencies and using a simplified hybrid-pi model, the following small-signal characteristics can be derived.
| Definition | Expression | |
|---|---|---|
| Current gain | ||
| Voltage gain | ||
| Input impedance | ||
| Output impedance |
If the emitter degeneration resistor is not present, . As expected, when is increased, the input impedance is increased and the voltage gain is reduced.
Read more about this topic: Common Emitter
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