(Solved): solve the Question Q.2: For the op-amp circuit shown in Fig. Q2, assume \( R_{i}=\infty \) and \( R_ ...

Q.2: For the op-amp circuit shown in Fig. Q2, assume \( R_{i}=\infty \) and \( R_{o}=0 \), but the op-amp has a finite gain \( A \). (a) Write the closed-loop transfer function in the form \[ A_{v f}=\frac{A}{1+\beta A} \] (b) If \( A=10^{5} \) and \( A_{v f}=20 \), what is the required \( R_{2} / R_{1} \) ? (3 pts.) Nig. 42