Question

What is the active region for transistors?

• A. The active region is that region in which the emitter-base junction is forward bias while the collector-base junction is also forward bias.
• B. The active region is that region in which the emitter-base junction is forward bias while the collector-base junction is reverse bias.
• C. The active region is that region in which the emitter-base junction is reverse bias while the collector-base junction is reverse bias.
• D. The active region is that region in which the emitter-base junction is reverse bias while the collector-base junction is forward bias.

Answer 1

The correct option is B

The active region is that region in which the emitter-base junction is forward bias while the collector-base junction is reverse bias.

1. Definition: The active area is defined as the region in which the emitter-base junction is forward biased and the collector-base junction is reverse biased.
2. A transistor seems to be a three gadget with an emitter, base, as well as collector. For something like a common source setup, the input terminal is indeed the emitter-base terminal as well as the outgoing terminal would be the base-collector terminal.
3. This same emitter-base junction is forward biased throughout the applied region, whereas the base-collector junction is reverse biased.

Therefore, option B is the appropriate choice.