Current amplifier- Conditions to drive low resistance load

Q.  Which among the below specified conditions is responsible to drive a low resistance load by the current amplifier circuit?
- Published on 23 Sep 15

a. Rs >> Ri
b. R0 >> RL
c. Rs << Ri
d. R0 << RL

ANSWER: R0 >> RL

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    An amplifier which produces an output current proportional to the signal current, where the proportionality factor is independent of the source or load resistances, is called as 'Current amplifier'.

    Ideally, current amplifier must have zero value of input resistance and infinite value of output resistance. However, practically, it indicates that the input resistance should be very small while output resistance should be very large.

    Since Rs >> Ri (source resistance is very larger than input resistance), high resistance source drives the current amplifier.

    Similarly, as R0 >>RL (output resistance is very larger than load resistance),so the current amplifier is driven by a low resistance load.

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