Question:
The emitter of a transistor is _______ doped.
The emitter of a transistor is _______ doped.
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In BJTs, the emitter is always the most heavily doped region to ensure maximum injection of charge carriers.
Updated On: Jun 23, 2025
- Lightly
- Heavily
- Moderately
- Non
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The Correct Option is B
Solution and Explanation
Step 1: Purpose of the emitter
The emitter injects charge carriers (electrons or holes) into the base region.
Step 2: Doping rationale
To ensure a high injection efficiency, the emitter is heavily doped so that it can provide a large number of charge carriers.
Step 3: Comparison
Base is lightly doped, collector is moderately doped. The doping gradient supports unidirectional carrier flow.
Conclusion: The emitter is heavily doped to efficiently inject carriers into the base.
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