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What should be the level of input resistance to allow the occurrence of source loading in common base amplifier configuration?

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What should be the level of input resistance to allow the occurrence of source loading in common base amplifier configuration?

(a) Low

(b) High

(c) Moderate

(d) Stable

The question was posed to me in homework.

My question is based upon Frequency Compensation topic in portion Frequency Response of Electronic Devices & Circuits

1 Answer

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Correct choice is (a) Low

The explanation: As per the configuration of CB amplifier, it is obvious that its input resistance is very low whereas its output resistance is extremely high.  However, the lower value of input resistance allows the provision of source loading in common base amplifier circuit. Thus, there is no current amplification due to unity current gain. These all reasons ultimately contribute to high level of voltage gain.

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