railway RRB JE (CBT I + CBT II) Mock Test 2024 Analog Electronics Op-Amp and Its Applications Op Amp Circuit Calculations
The op-amp shown in the figure is ideal. The input impedance \(\frac{{{v_{in}}}}{{{i_{in}}}}\) is given by
1
\(z\frac{{{R_1}}}{{{R_2}}}\)
2
\(- Z\frac{{{R_2}}}{{{R_1}}}\)
3
Z
4
\(- Z\frac{{{R_1}}}{{{R_1} + {R_2}}}\)