= 1.1 eV , = 5.23 × 1015 cm-3 K-3/2, = 86 x 10-6 eV/K and = 26 mV) Eg B k VT (6 marks) A forward bias pn junction has the current = 3.5 mA. Consider that diode is operating ID at room temperature (300°K). If the reverse saturation current, = 1.5×10-11mA and = 1, determine the diode voltage IS n VD. (6 marks) A diode circuit and its load line are as shown in Fig. 2(c). (2+6 marks) Fig. 2(c) Design the circuit when the diode is operating in forward bias condition. Determine the diode current ID and diode forward resistance rf in the circuit using a piecewise linear model. Consider the cut-in voltage of the diode, = 0.65V. Vγ Question 3 [15 marks] A half wave rectifier circuit is shown in Fig. 3(a). Assume that the diode cut in voltage = 0.7V. The transformer primary is connected to an AC source voltage, vp (rms) = 220V Vγ (6+2 marks) Fig. 3(a) Design the circuit so that the peak output voltage, (peak) = 9V. vo Calculate the peak current in the circuit for load resistance = 50 RL Ω.
Eg = 1.1 eV , B = 5.23 × 1015 cm-3 K-3/2, k = 86 x 10-6 eV/K and VT = 26 mV) (6 marks) A forward bias pn junction has the current ID = 3.5 mA. Consider that diode is operating at room temperature (300°K). If the reverse saturation current, IS = 1.5×10-11mA and n = 1, determine the diode voltage VD. (6 marks) A diode circuit and its load line are as shown in Fig. 2(c). (2+6 marks) Fig. 2(c) Design the circuit when the diode is operating in forward bias condition. Determine the diode current ID and diode forward resistance rf in the circuit using a piecewise linear model. Consider the cut-in voltage of the diode, Vγ = 0.65V. Question 3 [15 marks] A half wave rectifier circuit is shown in Fig. 3(a). Assume that the diode cut in voltage Vγ = 0.7V. The transformer primary is connected to an AC source voltage, vp (rms) = 220V (6+2 marks) Fig. 3(a) Design the circuit so that the peak output voltage, vo (peak) = 9V. Calculate the peak current in the circuit for load resistance RL = 50 Ω.
Midterm%20SEM%201%202016_2017.docx