Analog Electronics QUESTION 1 (25 marks) -(CLO1-PLO1) a. Sketch the I–V characteristics of an ideal diode, silicon diode, germanium diode and zener voltage of 6.3V. Label the sketched diagrams...

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Analog Electronics QUESTION 1 (25 marks) -(CLO1-PLO1) a. Sketch the I–V characteristics of an ideal diode, silicon diode, germanium diode and zener voltage of 6.3V. Label the sketched diagrams clearly. [16 marks] b. Explain in your own word, the phenomena forward bias characteristics of PN junction diode. -(CLO1-PLO1] [9 marks] QUESTION 2 (25 marks) -(CLO1-PLO1) A circuit is shown in Figure 1 below. The diodes are germanium type with forward biased voltage of 0.3 V. V1 is a variable voltage source while V2 supplies voltage of 5 V. Figure 1 (a) Calculate the diode currents ID2 and ID1, if V1 is set to 5V. Determine the setting of V1 so that the diode currents ID2 = ID1 [12 marks] (b) By changing the diode to silicon type diode, calculate the diode currents ID2 and ID1, when V1 is set to 2 V [13 marks] QUESTION 3 (25 marks) -(CLO2-PLO2) A silicon transistor is biased as shown in the figure 2 below: Figure 2 Note: The circuit is operating at room temperature. (a) Explain the differences between operation of BJT active, saturation, inverse active and cutoff region [8 marks] (b) Find IB, IC, and IE of the silicon transistor. [7 marks] (c) Find VCE, VBE, and VCB of the silicon transistor. [6 marks] (d) Determine the minimum VCC for this transistor to remain being biased in forward active mode provided VCE(SAT) is 0.4V. [4 marks] QUESTION 4 (25 marks) -(CLO2-PLO2) A Class AB power amplifier circuit is shown in the figure 3 below. The saturation voltage of the transistor VCE(sat) is 0.5V. Figure 3 (a) Calculate the quiescence voltage, VCEQ of this amplifier. [5 marks] (b) Calculate the maximum peak values for the output voltage and current of this amplifier. [5 marks] (c) Calculate the maximum peak power of this amplifier [5 marks] (d) Calculate the maximum output power of this amplifier [5 marks] (e) Calculate the efficiency of this amplifier. [5 marks] APPENDIX Quiescence voltage, VCEQ =VCC/2 Maximum peak output voltage, Vout(peak) = VCEQ Maximum peak output current, Iout(peak) @ Ic(sat) = VCEQ/RL Maximum peak power, Pout(peak) = Ic(sat) VCEQ Maximum power, Pout(max) = 0.5V CEQ x I c(sat) Efficiency, END OF COURSE ASSIGNMENT 1 CC SAT CE CC V V V 4 ) ( ) ( p h ´ - =
Jan 22, 2021
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