The op amp in the series-series circuit of Fig. P7.14 drives a nonlinear load that has been modeled with two diodes and a resistor R1. Let R1 5 1 kV and VD1(on) 5 VD2(on) 5 0.75 V. (a) Assuming av 5...

The op amp in the series-series circuit of Fig. P7.14 drives a nonlinear load that has been modeled with two diodes and a resistor R1. Let R1 5 1 kV and VD1(on) 5 VD2(on) 5 0.75 V. (a) Assuming av 5 `, sketch and label vI (t), iO(t), and vOA(t) if R2 5 2 kV and vI (t) is a triangular wave with peak values of 63 V. Comment on the waveform of vOA(t). Hint: consider fi rst the case in which D1 and D2 are both off, then the case of D1 on, and fi nally the case of D2 on. (b) How are the waveforms of iO(t) and vOA(t) affected if the op amp is no longer ideal, but has av 5 103 V/V? How is the waveform of vE(t)?