R This problem concerns the circuit illustrated in Figure 2 : VI www R wwww d) Use R Figure 2 www R3 = = 1.0k R2 1.0k R = 0.5k R4 = 1 D ip + For D: ip = Is(eD/VTH - 1) with Is = 1 10- A and VTH your model of part c) to find va(t) if vi = VD RA a) Find the Thvenin equivalent circuit for the circuit connected to the diode. b) Assume that for bias point determination the diode can be modeled by an ideal diode and a 0.6 volt battery. What are up and in when v = 4 volts? = 25m V. c) Find a linear equivalent model for this diode valid for small signal incremental operation about the bias point determined from part b. 4+0.004 coswt volts.