hw5 (2)

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Dec 6, 2023

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1 HW5 Please write your answers in the boxes provided for Part 2. You are not required to submit the solutions to Part 1. (Please still include these pages in the submission so Gradescope knows how many pages to expect.) Part 1 (Practice Problems): Q1. Textbook Problem 9.6 Sketch i versus v to scale for the circuits shown in Figure P9.6. The reverse-breakdown voltages of the Zener diodes are shown. Assume voltages of 0.6V for all diodes including the Zener diodes when current flows in the forward direction. Figure P9.6 Q2. Textbook Problem 9.37 Find the values of I and V for the circuits of Figure P9.37, assuming that the diodes are ideal. Figure P9.37

2 Q3. Textbook Problem 9.59 Consider the battery-charging circuit shown in Figure 9.25 on page 476, in which 𝑣𝑣 𝑠𝑠 ( 𝑡𝑡 ) = 20sin (200 𝜋𝜋𝑡𝑡 ) , 𝑅𝑅 = 80 Ω , 𝑉𝑉 𝐵𝐵 = 12 𝑉𝑉 , and the diode is ideal. a. Sketch the current 𝑖𝑖 ( 𝑡𝑡 ) to scale versus time. b. Determine the average charging current for the battery. [Hint: The average current is the charge that flows through the battery in one cycle divided by the period.] Figure 9.25 Q4. Textbook Problem 9.63 Sketch to scale the output waveform for the circuit shown in Figure P9.63. Assume that the diodes are ideal. Figure P9.63 Q5. Textbook Problem 9.28 Consider the voltage regulator shown in Figure P9.28. The source voltage 𝑉𝑉 𝑠𝑠 varies from 10 to 14V, and the load current 𝑖𝑖 𝐿𝐿 varies from 50 to 100mA. Assume that the Zener diode is ideal. Determine the largest value allowed for the resistance 𝑅𝑅 𝑠𝑠 so that the load voltage 𝑣𝑣 𝐿𝐿 remains constant with variations in load current and source voltage. Determine the maximum power dissipation in 𝑅𝑅 𝑠𝑠 . Figure 9.28

3 Part 2 (Graded) Q1. Textbook Problem 9.40 The circuit shown in Figure P9.40(a) is a type of logic gate. Assume that the diodes are ideal. The voltages 𝑉𝑉 𝐴𝐴 and 𝑉𝑉 𝐵𝐵 independently have values of either 0V (for logic 0, or low) or 5V (for logic 1, or high). For which of the four combinations of input voltages is the output high (i.e., 𝑉𝑉 0 = 5 𝑉𝑉 )? What type of logic gate is this? Repeat for the circuit of Figure P9.40(b). Figure 9.40 𝑽𝑽 𝑨𝑨 𝑽𝑽 𝑩𝑩 (a) 𝑽𝑽 𝟎𝟎 (b) 𝑽𝑽 𝟎𝟎 Low Low Low High High Low High High Logic Gate (a) (b)

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4 Q2. Textbook Problem 9.66 Sketch the transfer characteristic ( 𝑣𝑣 0 versus 𝑣𝑣 𝑖𝑖𝑖𝑖 ) to scale for the circuit shown in Figure P9.66. Allow 𝑣𝑣 𝑖𝑖𝑖𝑖 to range from -5V to +5V and assume that the diodes are ideal. Figure P9.66 Add your sketch here:

5 Q3. Textbook Problem 9.70 Sketch to scale the steady-state output waveform for the circuit shown in Figure P9.70. Assume that RC is much larger than the period of the input voltage and that the diodes are ideal. Figure P9.70 Add your sketch here:

6 Q4. Textbook Problem 9.72 Design a clipper circuit to clip off the portions of an input voltage that fall above 3V or below -5V. Assume that diodes having a constant forward drop of 0.7V are available. Ideal Zener diodes of any breakdown voltage required are available. DC voltage sources of any value are available. Answer:

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