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Consider the following circuit configurations:
1. Common emitter
2. Common base
3. Emitter follower
The correct sequence in increasing input impedance is
- a)2, 1, 3
- b)1, 2, 3
- c)1, 3, 2
- d)3, 2, 1
Correct answer is option 'A'. Can you explain this answer?
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Consider the following circuit configurations:1. Common emitter2. Comm...
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Consider the following circuit configurations:1. Common emitter2. Comm...
Understanding Input Impedance in BJT Configurations
Input impedance is a crucial parameter in transistor amplifiers, influencing how they interact with preceding circuit stages. The three common configurations of bipolar junction transistors (BJTs) are common emitter, common base, and emitter follower. Each has distinct characteristics regarding input impedance.
1. Common Emitter Configuration
- The common emitter configuration has a moderate input impedance, typically in the range of 1kΩ to 100kΩ.
- It is often used for voltage amplification and has a relatively high gain but lower input impedance compared to the other configurations.
2. Common Base Configuration
- The common base configuration offers the lowest input impedance, usually around 50Ω to 500Ω.
- This configuration is less commonly used for voltage amplification as it has low gain and input impedance, making it suitable for specific applications like RF amplifiers.
3. Emitter Follower Configuration
- The emitter follower, also known as common collector, has the highest input impedance, typically ranging from tens of kΩ to several MΩ.
- This configuration is designed for impedance matching, providing a buffered output while maintaining high input impedance.
Sequence of Input Impedance
- When comparing the input impedances:
- Common Base: Lowest (2)
- Common Emitter: Moderate (1)
- Emitter Follower: Highest (3)
Thus, the correct sequence in increasing input impedance is:
2, 1, 3
Therefore, option 'A' is indeed correct, reflecting the expected trend of input impedance across these configurations. Understanding these differences helps in selecting the appropriate configuration for specific circuit requirements.
Input impedance is a crucial parameter in transistor amplifiers, influencing how they interact with preceding circuit stages. The three common configurations of bipolar junction transistors (BJTs) are common emitter, common base, and emitter follower. Each has distinct characteristics regarding input impedance.
1. Common Emitter Configuration
- The common emitter configuration has a moderate input impedance, typically in the range of 1kΩ to 100kΩ.
- It is often used for voltage amplification and has a relatively high gain but lower input impedance compared to the other configurations.
2. Common Base Configuration
- The common base configuration offers the lowest input impedance, usually around 50Ω to 500Ω.
- This configuration is less commonly used for voltage amplification as it has low gain and input impedance, making it suitable for specific applications like RF amplifiers.
3. Emitter Follower Configuration
- The emitter follower, also known as common collector, has the highest input impedance, typically ranging from tens of kΩ to several MΩ.
- This configuration is designed for impedance matching, providing a buffered output while maintaining high input impedance.
Sequence of Input Impedance
- When comparing the input impedances:
- Common Base: Lowest (2)
- Common Emitter: Moderate (1)
- Emitter Follower: Highest (3)
Thus, the correct sequence in increasing input impedance is:
2, 1, 3
Therefore, option 'A' is indeed correct, reflecting the expected trend of input impedance across these configurations. Understanding these differences helps in selecting the appropriate configuration for specific circuit requirements.
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Solutions for Consider the following circuit configurations:1. Common emitter2. Common base3. Emitter followerThe correct sequence in increasing input impedance isa)2, 1, 3b)1, 2, 3c)1, 3, 2d)3, 2, 1Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE).
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