Problems -
Problem 1 - Find v_{0} in the op amp circuit of Fig. 1.
Problem 2 - Compute i_{0}(t) in the op amp circuit in Fig. 2 if v_{s} = 4 cos(10^{4}t).
Problem 3 - If the input impedance is defined as Z_{in} = v_{s}/I_{s}, find the input impedance of the op amp circuit in Fig. 3 when R_{1} = 10 kΩ, R_{2} = 20 kΩ, X_{1} = 10 nF, C_{1} = 20 nF and ω = 5000 rad/s.