1-1. The current source in Example 1-1 is reversed so that positive current is upward. The current source is to be connected to the voltage source by alternately closing S, and S,. Draw a circuit that has a MOSFET and a diode to accomplish this switching. + + V +. Vs I, Vs v2 S2 V2 S2 + tiz (a) (b) i iz S1 S2 (0, I) Closed (0, I.) Closed en en V1 V2 (V, 0) (-V, 0) (c) (d) S1 V A S2 S2 (e) Figure 1-13 Circuit for Example 1-1. (a) S, closed, S, open; (b) S, open, S, closed; (c) operating points for S; (d) operating points for S;; (e) switch implementation using a MOSFET and diode; (f) switch implementation using two MOSFETS (synchronous rectification).