Question

(d) The input resistance is highest for a

| (i) CB amplifier

(ii) CC amplifier

(iii) CE amplifier

(iv) None of the above
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Answer 1

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The input resistance is highest for a CB amplifier.

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Answer 2

Answer:

The input resistance is highest for a Common Collector (CC) Amplifier.

Explanation:

• In common Emitter configuration, the Emitter terminal of transistor is common between input and output.
• The common emitter configuration is used as an amplifier. So, its input resistance is low so that it can drive to any source
• In common Base configuration, the Base terminal of transistor is common between input and output.
• The common base configuration is used as an amplifier. So, its input resistance is low so that it can drive to any source.
• In common Collector configuration, the Emitter terminal of transistor is common between input and output.
• The common collector configuration is used as an impedance matching device . So, its input resistance is high and output resistance is low.