(a) For the ideal inverting op-amp circuit with T-network, shown in Figure 9.12, the circuit parameters are \(R_{1}=10 \mathrm{k} \Omega, R_{2}=R_{3}=50 \mathrm{k} \Omega\), and \(R_{4}=5 \mathrm{k} \Omega\). Determine the closed-loop voltage gain.

(b) Determine a new value of \(R_{4}\) to produce a voltage gain of (i) \(A_{v}=-100\) and (ii) \(A_{v}=-150\).

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iz www ww R R3 RA R ww (2) v=0 + Figure 9.12 Inverting op-amp with T-network