Question

# Because of a manufacturing error, the open-loop gain of each op-amp in the circuit is only $A_{o L}=100$. The open-loop input and output resistances are $R_i=10 \mathrm{k} \Omega$ and $R_o=1 \mathrm{k} \Omega$, respectively. Determine the closed-loop parameters: (a) $R_{i f}$, (b) $R_{o f}$, and (c) $A_{C L}=v_{O 2} / v_I$. (d) What is the ratio of the actual closed-loop gain to the ideal value?

Solution

Verified
An amplifier with manufacturing error is given. We need to determine, (a) input resistance $R_{if}$ (b) output resistance $R_{of}$ (c) closed loop gain $A_{CL}$ (d) ratio of actual closed loop gain to the ideal value.
Given that, $A_{OL}=100$ $R_i=10\mathrm{~k\Omega}$ $R_o=1\mathrm{~k\Omega}$