For the op-amp used in the inverting amplifier configuration in Figure P14.10, the open-loop parameters are (A_{O

Question:

For the op-amp used in the inverting amplifier configuration in Figure P14.10, the open-loop parameters are $A_{O L}=10^{3}$ and $R_{o}=0$. Determine the closed- loop gain $A_{C L}=v_{O} / v_{I}$ and input resistance $R_{i f}$ for an openloop input differential-mode resistance of:

(a) $R_{i}=1 \mathrm{k} \Omega$,

(b) $R_{i}=10 \mathrm{k} \Omega$, and

(c) $R_{i}=100 \mathrm{k} \Omega$.

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