Question

Section 3.3: Modeling the Diode *3.35 Consider the graphical analysis of the diode circuit of Fig. 3.10 with VDD-1 V. R-1 kQ, and a diode having Ig-10-15 A. Calculate a small number of points on the diode characteristic in the vicinity of where you expect the load line to intersect it, and use a graphical process to refine your estimate of diode current. What value of diode current and voltage do you find? Analytically, find the voltage corresponding to your estimate of current. By how much does it differ from the graphically estimated value? 3.36 Use the iterative-analysis procedure to determine the diode current and voltage in the circuit of Fig. 3.10 for VDD-1 V. R-1 k, and a diode having lg-10-15 A 3.37 A "1-mA diode" (ie., one that has vp-0.7 V at ip-1 mA) is connected in series with a 500-resistor to a 1.0 V supply. (a) Provide a rough estimate of the diode current you would expect. (b) Estimate the diode current more closely using iterative analysis. 3.38 For the circuits shown in Fig. P3.1, using the constant-voltage-drop (VD-0.7V) diode model, find the voltages and cuments indicated 3.39 For the circuits in Fig P3.3, using the constant-voltage-drop (Vp-0.7V) diode model, find the values of the labeled currents and voltages. D3.40 Repeat Problem 3.4, representing the diode by the constant-voltage-drop (VD -0.7V) model. How different is the resulting design? 3.41 Partial specifications of a collection of zener diodes are provided below Complete the table by finding the missing value for each diode. Also, in each case, find the reverse voltage across the zener at 10 mA current. (a) VZT 3V IZT 2mA V2 VzⓇlz-10 mA 5002 888 (b) SV 5mA (c) 6V 150 4.5 V 5.7 V (d) 1 MA 100 3.42 Consider the circuit in Fig. 3.10 with VDD-3V and R-32 (a) Find the current using a constant-voltage-drop model. (b) What value of Isis required to make this solution exact? (c) Approximately how much will the current change from this value if Ig increases by a factor of 1007

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