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An emitter follower has high input impendance because
- a)there is negative feedback in the base- emitter circuit.
- b)large emitter resistance is used.
- c)the emitter-base junction is highly reverse biased.
- d)large biasing resistance is used.
Correct answer is option 'A'. Can you explain this answer?
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An emitter follower has high input impendance becausea)there is negati...
Understanding Emitter Followers
An emitter follower, also known as a common-collector amplifier, is a popular transistor configuration used in electronics. Its high input impedance is a key feature that makes it beneficial in various applications.
Importance of Negative Feedback
- Negative Feedback Mechanism: In an emitter follower, the feedback from the emitter to the base helps stabilize the operating point and reduces distortion.
- Base-Emitter Circuit: The circuit inherently involves negative feedback since any increase in output voltage at the emitter leads to a reduction in base current due to the voltage drop across the base-emitter junction.
- Input Impedance: This feedback mechanism results in a high input impedance because the base current is effectively reduced. The transistor's Beta (current gain) helps ensure that only a small base current is needed to control a larger emitter current.
Comparison with Other Factors
- Emitter Resistance: While larger emitter resistances can increase linearity and stability, they do not directly contribute to high input impedance in this configuration.
- Emitter-Base Junction: The statement about the junction being reverse biased is misleading in this context. In an emitter follower, the junction is forward-biased during normal operation.
- Biasing Resistance: Although biasing resistance can influence stability, it does not inherently increase input impedance.
Conclusion
In summary, the high input impedance of an emitter follower is primarily due to the negative feedback in the base-emitter circuit, which minimizes the base current required. This feature makes the emitter follower ideal for buffering applications where impedance matching is essential.
An emitter follower, also known as a common-collector amplifier, is a popular transistor configuration used in electronics. Its high input impedance is a key feature that makes it beneficial in various applications.
Importance of Negative Feedback
- Negative Feedback Mechanism: In an emitter follower, the feedback from the emitter to the base helps stabilize the operating point and reduces distortion.
- Base-Emitter Circuit: The circuit inherently involves negative feedback since any increase in output voltage at the emitter leads to a reduction in base current due to the voltage drop across the base-emitter junction.
- Input Impedance: This feedback mechanism results in a high input impedance because the base current is effectively reduced. The transistor's Beta (current gain) helps ensure that only a small base current is needed to control a larger emitter current.
Comparison with Other Factors
- Emitter Resistance: While larger emitter resistances can increase linearity and stability, they do not directly contribute to high input impedance in this configuration.
- Emitter-Base Junction: The statement about the junction being reverse biased is misleading in this context. In an emitter follower, the junction is forward-biased during normal operation.
- Biasing Resistance: Although biasing resistance can influence stability, it does not inherently increase input impedance.
Conclusion
In summary, the high input impedance of an emitter follower is primarily due to the negative feedback in the base-emitter circuit, which minimizes the base current required. This feature makes the emitter follower ideal for buffering applications where impedance matching is essential.
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An emitter follower has high input impendance becausea)there is negative feedback in the base- emitter circuit.b)large emitter resistance is used.c)the emitter-base junction is highly reverse biased.d)large biasing resistance is used.Correct answer is option 'A'. Can you explain this answer?
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