Which of the following is NOT true for a common collector transistor?a)Input impedance is highb)It can be used for impedance matchingc)Output impedance is lowd)Power gain is highCorrect answer is option 'D'. Can you explain this answer? - EduRev Electronics and Communication Engineering (ECE) Question

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Which of the following is NOT true for a common collector transistor?

a)
Input impedance is high
b)
It can be used for impedance matching
c)
Output impedance is low
d)
Power gain is high

Correct answer is option 'D'. Can you explain this answer?

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Which of the following is NOT true for a common collector transistor?a...

The input impedance is high in the common collector because this is calculated by the Beta (gain) of the transistor, multiplied by the emitter resistance, whereas the current gain is due to the output impedance being inversely proportional to the current gain of the transistor in parallel to Re
Common collector configuration, also known as emitter follower provides high input impedance and low output impedance. So they are used for the purpose of impedance matching.
In common collector configuration, the collector terminal is common to both input and output terminals. The current gain in the common-collector configuration is therefore the ratio of the emitter current to the base current. Since the emitter current is very high as compared to the base current, we get current amplification. It provides a voltage gain of less than unity.

common collector configuration has low voltage gain and high current gain. The power gain of the common collector amplifier is medium. so option 4 is wrong

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Which of the following is NOT true for a common collector transistor?a)Input impedance is highb)It can be used for impedance matchingc)Output impedance is lowd)Power gain is highCorrect answer is option 'D'. Can you explain this answer?

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