ex2_s06 - University of Florida Department of Electrical...

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University of Florida EEL 3701—Spring 2006 Dr. Eric M. Schwartz Department of Electrical & Computer Engineering Monday, 27 March 2006 24-Apr-06 4:00 PM Exam 2 Page 1/ 11 , Last Name , First Name Good luck & Go Gators!!! Final four! Can you believe it! Instructions: Turn off all cell phones , beepers and other noise making devices . Show all work on the front of the test papers. Box each answer. If you need more room, make a clearly indicated note on the front of the page, "MORE ON BACK", and use the back. The back of the page will not be graded without an indication on the front. You may not use any notes, HW, labs, other books, or calculators. This exam counts for 22 % of your total grade. Read each question carefully and follow the instructions . You must pledge and sign this page in order for a grade to be assigned. Put your name at the top of this test page and be sure your exam consists of 11 distinct pages. Sign your name and add the date below. For each circuit design, equations must not be used as replacements for circuit elements. For each mixed-logic circuit diagram, label inputs of each gate with the appropriate logic equations. Boolean expression answers must be in lexical order , i.e., /A before A, A before B, & D 3 before D 2 ). Label the inputs and outputs of each circuit with activation-levels. For K-maps, label each grouping with the appropriate equation. The point values for problems may be changed at prof’s discretion. PLEDGE: On my honor as a University of Florida student, I certify that I have neither given nor received any aid on this examination, nor I have seen anyone else do so. SIGN YOUR NAME DATE ( 27 March 2006 ) Page Available Points 2 13 3-4 20 5 10 6-7 22 8 10 9-11 25 TOTAL 100 Regrade comments below. Give page # and problem # and reason for the petition. May the Schwartz be with you! Please read carefully.
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University of Florida EEL 3701—Spring 2006 Dr. Eric M. Schwartz Department of Electrical & Computer Engineering Monday, 27 March 2006 24-Apr-06 4:00 PM Exam 2 Page 2/ 11 , Last Name , First Name [3%] 1. Design an active-high switch circuit to the right. Label the output of this switch A(H). The symbols for the two switches you can use are shown below. Draw the switch in its true position. [5%] 2. When we started using the CPLD boards, several students reported that they had LEDs that were sometimes on, but dim. Part of the reason for this is that the CPLD chip uses 3.3V for Vcc, but we use 5V as the high voltage in the LED and switch circuits. There are two possible output values when using the CPLD: 0V and 3.3V. Draw two LED circuits, one that will turn on for an active-low CPLD output [B(L)] and one that will turn on for an active-high CPLD output [C(H)]. Can either of your circuits have a dim LED for a possible CPLD output. If so, what CPLD voltage output will cause the LED to be dim? If so, does the dim LED represent a true or false?
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ex2_s06 - University of Florida Department of Electrical...

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