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Which of the following conditions is responsible to drive a low resistance load by the current amplifier circuit?

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Which of the following conditions is responsible to drive a low resistance load by the current amplifier circuit?

(a) Ro << RL

(b) Ro >> RL

(c) Rs >> Ri

(d) Rs << Ri

I have been asked this question during an online interview.

My question comes from Properties of Negative Feedback topic in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Correct choice is (b) Ro >> RL

The explanation is: As we know, a current amplifier is an amplifier which produces an output current proportional to the signal current, where the proportionality factor is independent of the source or load resistances.

Ideally, current amplifier must have zero value of input resistance and infinite output resistance.

However it indicates that the input resistance should be very small while output resistance should be very large.

Since,   Rs>>Ri; High resistance source drives the current amplifier.

Similarly, as Ro >> RL    so the current amplifier is driven by low resistance load.

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