The op amp shown in Fig. 10.65 has an infinite input impedance, zero output impedance

Chapter 10, Problem 59

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The op amp shown in Fig. 10.65 has an infinite input impedance, zero output impedance, and a large but finite (positive, real) gain, \(A=-\mathbf{V}_{o} / \mathbf{V}_{i}\). (a) Construct a basic differentiator by letting \(\mathbf{Z}_{f}=R_{f}\), find \(\mathbf{V}_{o} / \mathbf{V}_{s}\), and then show that \(\mathbf{V}_{o} / \mathbf{V}_{s} \rightarrow-j \omega C_{1} R_{f}\) as \(\mathbf{A} \rightarrow \infty\). (b) Let \(\mathbf{Z}_{f}\) represent \(C_f\) and \(R_f\) in parallel, find \(\mathbf{V}_{o} / \mathbf{V}_{s}\), and then show that \(\mathbf{V}_{o} / \mathbf{V}_{s} \rightarrow-j \omega C_{1} R_{f} /\left(1+j \omega C_{f} R_{f}\right)\) as \(\mathbf{A} \rightarrow \infty\).

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