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  1. The circuit shown is

    2. A.
    voltage series feedback amplifier
    B.
    transconductance amplifier
    C.
    transresistance amplifier with open circuit mutual resistance RF
    D.
    transresistance amplifier with short circuit mutual resistance RF

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    Answer : Option C

    Explanation :

    Circuit can be redrawn as.

    This is an inverting amplifier with inverting terminal virtual ground.

    Hence, Vo = - iin RF

    This RF is termed as mutual resistance here, Rm.

    output voltage with load

    Where R0 is output Resistance of Op-Amp.

    if RL >> R0 output terminals become open circuited.

    and VoL = Rm.Iin

    where Rm work as mutual resistance.

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