ELEC 226, Spring 2011
Prof. Rich Kozick

Homework 5


Date Assigned: Tuesday, March 22, 2011
Date Due: Thursday, March 31 Friday, April 1, 2011 at noon
  1. Reading: In the Ulaby/Maharbiz text, please study Chapter 5, sections 1 through 4. You should also review Chapter 4 on operational amplifiers before the week of April 4.

  2. Schedule: There is no lecture class on Thursday, March 24. We will make up the class at 2:00 PM on Monday and Wednesday, March 28 and 30, in room CC 4 (where we have lab), so please attend on your assigned lab day. In the classes on March 28 and 30, we will review the first exam and transformers. I will also help you with the homework problems on this assignment, which will be due on March 31.

    We will begin studying Chapter 5 in class on Tuesday, March 29. For the rest of the semester, we will study the transient response of circuits in Chapters 5 and 6. In lab, we will design and implement a waveform generator that will generate square, triangle, and sine waves with variable amplitude and variable frequency. The lab project will use op amps, so please review Chapter 4 in the text. We will have labs in the weeks of April 4, 11, 18 and no lab in the week of April 25.

  3. Please solve the following problems in Chapter 13 and submit solutions in class on Thursday, March 31 Friday, April 1, 2011 at noon .
    Answers to the problems are posted here so you can check your work.
    Chapter 13: Problems 1, 10, 14, 22, 23, 26, and 27.
    Notes:
    • The circuit in Problem 13.1 is not realistic because the coupling coefficient k is equal to 2 for the given value of M. I suggest that you repeat the analysis using M = 0.1 H, which corresponds to k = 1 (perfect coupling).
    • Recall that we solved Problem 13.21 in class, which is similar to 13.22.
    • In Problem 13.26, consider KCL at the two nodes where the capacitor is connected. Can you see that zero current flows through the capacitor? Therefore you will get the same result for average power to the load resistor if you analyze the circuit with the capacitor disconnected. Try to explain what effect, if any, the capacitor has on the circuit.
      (Hint: Place a reference voltage of 0 V at the negative terminal of the source, and consider the voltage with respect to the reference at all nodes in the circuit. Are the node voltages different if the capacitor is disconnected?)

  4. Please solve the following problems and submit solutions in class on Thursday, March 31. These problems include using transformers to maximize power transfer to a load.
    No additional problems are required for March 31 (the problems from the text are enough!). We will solve some of the supplemental problems linked below in class during the week of March 28. You should study these problems for Exam 2 and the Final Exam.
    Click here for supplemental problems

  5. Exam 2 will be on Tuesday, April 5. The main topic is mutual inductance and transformers, including Lab 3, Lab 4, Homework 4, and the problems in items 3 and 4 above. However, you may need to compute AC power quantities or maximize the average power to a load, so you should also review the material from Exam 1.

    The exam will be open-book and open-notes, and you will need your calculator.

Thank you.