1.

The op-amp shown in the figure is ideal. The input impedance \(\frac{{{v_{in}}}}{{{i_{in}}}}\) is given by

A. \(z\frac{{{R_1}}}{{{R_2}}}\)
B. \(- Z\frac{{{R_2}}}{{{R_1}}}\)
C. Z
D. \(- Z\frac{{{R_1}}}{{{R_1} + {R_2}}}\)
Answer» C. Z


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