(a) For the circuit shown in Figure 3(a), determine the voltage Vo at the output of the ideal-op-amp, when the switch S is: In position 1 In position 2. For

the circuit shown in Figure 3(b), a Si diode is used (at room temperature: 20°C) with R, = 30 ohms and V. = 0.6 V. Find the output voltage V. (t), when Vi (t) = 1.0 sinwt V \text { Is the small-signal diode model still valid in } 3 \mathrm{~b}(\mathrm{i}) \text { for } V_{1}(t)=5.0 \sin \omega t \mathrm{~V} \text { ? }