The phenomenon known as "Early Effect" in a bipolar transistor...
The Early Effect in a Bipolar TransistorThe phenomenon known as the "Early Effect" in a bipolar transistor refers to a reduction of the effective base-width caused by:
Explanation:Bipolar Transistor Basics:- A bipolar transistor consists of three layers: the emitter, base, and collector.
- The base region is typically lightly doped compared to the emitter and collector regions.
Early Effect:- The Early Effect, also known as the base-width modulation effect, refers to a decrease in the effective base width as the collector-base voltage increases.
- This effect reduces the base current and affects the transistor's performance.
Causes of the Early Effect:- The reduction of the effective base width is primarily caused by the reverse biasing of the base-collector junction.
- As the collector-base voltage increases, the depletion region widens, shrinking the base width.
- This narrowing of the base width results in a decrease in the transit time of charge carriers through the base region.
Effect on Transistor Performance:- The Early Effect can lead to a decrease in the current gain of the transistor, which affects its amplification capabilities.
- It also affects the frequency response and can introduce distortion in the output signal.
- Designers must consider the Early Effect when designing transistor circuits to ensure proper performance.
Therefore, the correct answer is B: the reverse biasing of the base-collector junction.