The circuit shown in Fig. 5.86 is a reasonably accurate model of an operational
Chapter 5, Problem 45(choose chapter or problem)
The circuit shown in Fig. 5.86 is a reasonably accurate model of an operational amplifier. In cases where \(R_i\) and A are very large and \(R_{o} \sim 0\), a resistive load (such as a speaker) connected between ground and the terminal labeled \(v_{\mathrm{out}}\) will see a voltage \(−R_f /R_1\) times larger than the input signal \(v_{\mathrm{in}}\). Find the Thévenin equivalent of the circuit, taking care to label \(v_{\mathrm{out}}\).
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