Op-amp model R. I -z, Rin AOL Zin Figure P13.47
The objective of this problem is to investigate the effects of finite open-loop gain, finite input impedance, and nonzero output impedance of the op amp on the voltage follower. The circuit, including the op-amp model, is shown in FigureP13.47 . a. Derive an expression for the circuit voltage gain vo/vs. Evaluate for AOL=105, Rin=1 MΩ, and Ro=25 Ω. Compare this result to the gain with an ideal op amp. b. Derive an expression for the circuit input impedance Zin=vs/is. Evaluate for AOL=105, Rin=1 MΩ and Ro=25Ω. Compare this result to the input impedance with an ideal op amp. c. Derive an expression for the circuit output impedance Zo. Evaluate for AOL=105, Rin=1 MΩ and Ro=25 Ω. Compare this result to the output impedance with an ideal op amp.
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