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Consider the following statements in respect of a CC amplifier.
1. It performs a resistance transformation from low to high resistance.
2. Its current gain is close to unity
3. Its voltage gain is close to unity
4. Its frequency range is higher than that of a CE-stage.
Which of the statements is given above are correct?
1. It performs a resistance transformation from low to high resistance.
2. Its current gain is close to unity
3. Its voltage gain is close to unity
4. Its frequency range is higher than that of a CE-stage.
Which of the statements is given above are correct?
- a)1, 2 and 4
- b)1 and 3
- c)Only 2 and 4
- d)3 and 4
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements in respect of a CC amplifier.1. It p...
The correct answer is option D: 3 and 4. Let's understand why.
1. Resistance Transformation:
A common collector (CC) amplifier, also known as an emitter follower, does not perform a resistance transformation from low to high resistance. It has a high input resistance and a low output resistance. The input resistance is mainly determined by the base-emitter junction resistance of the transistor, which is typically high. The output resistance is mainly determined by the emitter resistance, which is typically low.
2. Current Gain:
The current gain of a CC amplifier is close to unity. In a CC configuration, the emitter current is almost equal to the collector current. Hence, the current gain (β) of the transistor does not affect the overall current gain of the amplifier. Therefore, the current gain of a CC amplifier is approximately 1.
3. Voltage Gain:
The voltage gain of a CC amplifier is close to unity. The output voltage is approximately equal to the input voltage minus the base-emitter voltage drop (Vbe) of the transistor. Since Vbe is typically around 0.6 - 0.7 volts, the output voltage is slightly lower than the input voltage. Therefore, the voltage gain of a CC amplifier is slightly less than 1.
4. Frequency Range:
The frequency range of a CC amplifier is higher than that of a common emitter (CE) stage. A CE amplifier has a high voltage gain but a limited bandwidth due to the internal capacitances of the transistor. On the other hand, a CC amplifier has a lower voltage gain but a wider bandwidth. This is because the emitter follower configuration provides high input and low output impedance, allowing for better signal transmission across a wider frequency range.
In conclusion, the correct statements are:
- The current gain of a CC amplifier is close to unity.
- The frequency range of a CC amplifier is higher than that of a CE stage.
1. Resistance Transformation:
A common collector (CC) amplifier, also known as an emitter follower, does not perform a resistance transformation from low to high resistance. It has a high input resistance and a low output resistance. The input resistance is mainly determined by the base-emitter junction resistance of the transistor, which is typically high. The output resistance is mainly determined by the emitter resistance, which is typically low.
2. Current Gain:
The current gain of a CC amplifier is close to unity. In a CC configuration, the emitter current is almost equal to the collector current. Hence, the current gain (β) of the transistor does not affect the overall current gain of the amplifier. Therefore, the current gain of a CC amplifier is approximately 1.
3. Voltage Gain:
The voltage gain of a CC amplifier is close to unity. The output voltage is approximately equal to the input voltage minus the base-emitter voltage drop (Vbe) of the transistor. Since Vbe is typically around 0.6 - 0.7 volts, the output voltage is slightly lower than the input voltage. Therefore, the voltage gain of a CC amplifier is slightly less than 1.
4. Frequency Range:
The frequency range of a CC amplifier is higher than that of a common emitter (CE) stage. A CE amplifier has a high voltage gain but a limited bandwidth due to the internal capacitances of the transistor. On the other hand, a CC amplifier has a lower voltage gain but a wider bandwidth. This is because the emitter follower configuration provides high input and low output impedance, allowing for better signal transmission across a wider frequency range.
In conclusion, the correct statements are:
- The current gain of a CC amplifier is close to unity.
- The frequency range of a CC amplifier is higher than that of a CE stage.
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Consider the following statements in respect of a CC amplifier.1. It performs a resistance transformation from low to high resistance.2. Its current gain is close to unity3. Its voltage gain is close to unity4. Its frequency range is higher than that of a CE-stage.Which of the statements is given above are correct?a)1, 2 and 4b)1 and 3c)Only 2 and 4d)3 and 4Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements in respect of a CC amplifier.1. It performs a resistance transformation from low to high resistance.2. Its current gain is close to unity3. Its voltage gain is close to unity4. Its frequency range is higher than that of a CE-stage.Which of the statements is given above are correct?a)1, 2 and 4b)1 and 3c)Only 2 and 4d)3 and 4Correct answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Consider the following statements in respect of a CC amplifier.1. It performs a resistance transformation from low to high resistance.2. Its current gain is close to unity3. Its voltage gain is close to unity4. Its frequency range is higher than that of a CE-stage.Which of the statements is given above are correct?a)1, 2 and 4b)1 and 3c)Only 2 and 4d)3 and 4Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements in respect of a CC amplifier.1. It performs a resistance transformation from low to high resistance.2. Its current gain is close to unity3. Its voltage gain is close to unity4. Its frequency range is higher than that of a CE-stage.Which of the statements is given above are correct?a)1, 2 and 4b)1 and 3c)Only 2 and 4d)3 and 4Correct answer is option 'D'. Can you explain this answer?.
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