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The phenomenon known as "Early Effect" in a bipolar transistor refers to a reduction of the effective base-width caused by
- a)electron-hole recombination at the base
- b)the reverse biasing of the base-collector junction
- c)the forward biasing of the emitter-base junction
- d)the early removal of stored base charge during saturation-to-cutoff switching
Correct answer is option 'B'. Can you explain this answer?
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The phenomenon known as "Early Effect" in a bipolar transistor refers...
The correct answer is option B - the reverse biasing of the base-collector junction.
Explanation:
The Early Effect in a bipolar transistor refers to the phenomenon where the effective base-width is reduced due to the reverse biasing of the base-collector junction. This effect has a significant impact on the transistor's performance and behavior.
Under normal operating conditions, the base-collector junction of a bipolar transistor is forward biased while the emitter-base junction is forward biased. This allows the transistor to operate in its active mode, where it amplifies signals. However, in certain situations, such as when the collector voltage is increased or the base current is decreased, the base-collector junction can become reverse biased.
When the base-collector junction is reverse biased, a depletion region forms at the junction. This region creates a barrier for majority carriers (electrons for an NPN transistor) from entering the base region. However, it allows minority carriers (holes for an NPN transistor) to enter the collector region.
The reverse biasing of the base-collector junction causes the depletion region to expand towards the base region. As a result, the effective base-width is reduced. This reduction in the effective base-width has several implications:
1. Early Voltage (VA): The Early Voltage, denoted as VA, is a parameter that quantifies the Early Effect. It represents the change in collector current with respect to the collector voltage, while keeping the base current constant. A higher VA value indicates a stronger Early Effect.
2. Output Characteristics: The Early Effect impacts the output characteristics of the transistor. It causes the collector current to increase with an increase in collector voltage, even when the base current is kept constant. This leads to a non-linear relationship between the collector current and collector voltage.
3. Gain Variation: The reduction in the effective base-width also affects the current gain of the transistor. The Early Effect leads to a decrease in the current gain (β) of the transistor, resulting in a variation in the amplification factor.
In summary, the Early Effect in a bipolar transistor refers to the reduction in the effective base-width caused by the reverse biasing of the base-collector junction. This effect has implications on the transistor's output characteristics, gain variation, and overall performance.
Explanation:
The Early Effect in a bipolar transistor refers to the phenomenon where the effective base-width is reduced due to the reverse biasing of the base-collector junction. This effect has a significant impact on the transistor's performance and behavior.
Under normal operating conditions, the base-collector junction of a bipolar transistor is forward biased while the emitter-base junction is forward biased. This allows the transistor to operate in its active mode, where it amplifies signals. However, in certain situations, such as when the collector voltage is increased or the base current is decreased, the base-collector junction can become reverse biased.
When the base-collector junction is reverse biased, a depletion region forms at the junction. This region creates a barrier for majority carriers (electrons for an NPN transistor) from entering the base region. However, it allows minority carriers (holes for an NPN transistor) to enter the collector region.
The reverse biasing of the base-collector junction causes the depletion region to expand towards the base region. As a result, the effective base-width is reduced. This reduction in the effective base-width has several implications:
1. Early Voltage (VA): The Early Voltage, denoted as VA, is a parameter that quantifies the Early Effect. It represents the change in collector current with respect to the collector voltage, while keeping the base current constant. A higher VA value indicates a stronger Early Effect.
2. Output Characteristics: The Early Effect impacts the output characteristics of the transistor. It causes the collector current to increase with an increase in collector voltage, even when the base current is kept constant. This leads to a non-linear relationship between the collector current and collector voltage.
3. Gain Variation: The reduction in the effective base-width also affects the current gain of the transistor. The Early Effect leads to a decrease in the current gain (β) of the transistor, resulting in a variation in the amplification factor.
In summary, the Early Effect in a bipolar transistor refers to the reduction in the effective base-width caused by the reverse biasing of the base-collector junction. This effect has implications on the transistor's output characteristics, gain variation, and overall performance.
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The phenomenon known as "Early Effect" in a bipolar transistor refers...
In BJT, as the B-C reverse bias voltage increases, the B-C space charge region width increases, where xB (i.e. neutral base width) > A. Change in neutral base width will change the collector current. A reduction in base width will cause the gradient in minority carrier concentration to increase, which in turn will cause an increase in the diffusion current. This effect is known as "Early Effect".
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The phenomenon known as "Early Effect" in a bipolar transistor refers to a reduction of the effective base-width caused bya)electron-hole recombination at the baseb)the reverse biasing of the base-collector junctionc)the forward biasing of the emitter-base junctiond)the early removal of stored base charge during saturation-to-cutoff switchingCorrect answer is option 'B'. Can you explain this answer?
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