Question
Download Solution PDFWhich of the following statements is FALSE for a common-collector (CC) amplifier using a BJT?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe FALSE statement for a common-collector (CC) amplifier (emitter follower) using a BJT is: 4) It is a current-controlled current source.
Explanation:
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A common-collector amplifier is a voltage buffer (voltage gain ≈ 1), not a current source. It has low output impedance, making it unsuitable for acting as a current source (which requires high output impedance).
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While a BJT itself is a current-controlled device, the CC configuration does not function as a current source; it is designed for impedance matching and signal buffering.
Additional Information
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TRUE: CC amplifiers are used for impedance matching (high input impedance, low output impedance) with near-unity voltage gain (not voltage amplification).
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TRUE: CC amplifiers exhibit very high input impedance (due to series feedback) and low output impedance (emitter terminal behavior).
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TRUE: Among BJT configurations, CC has:
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Lowest output impedance (emitter-follower effect),
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Highest current gain (β + 1 ≈ β),
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Lowest voltage gain (≤1).
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Last updated on Jul 2, 2025
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