Electrical Engineering 145M - Spring 1996 - Derenzo - Final

# Electrical Engineering 145M - Spring 1996 - Derenzo - Final...

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NAME (please print) STUDENT (SID) NUMBER UNIVERSITY OF CALIFORNIA College of Engineering Electrical Engineering and Computer Sciences Berkeley EECS 145M: Microcomputer Interfacing Lab LAB REPORTS: 1 _________________ 2 __________________ 3 ___________________ 8 _________________ 9 __________________ 10 ___________________ 21 _________________ 22 __________________ 23 ___________________ 24 _________________ Total of 4 Lab Grades Total of 5 Question Sections Lab Participation Mid-Term #1 Mid-Term #2 Final Exam Total Course Grade _______________ (400 max) _______________ (100 max) _______________ (100 max) _______________ (100 max) _______________ (100 max) _______________ (200 max) _______________ (1000 max) COURSE LETTER GRADE Spring 1996 FINAL EXAM (May 17) Answer the questions on the following pages completely, but as concisely as possible. The exam is to be taken closed book . Use the reverse side of the exam sheets if you need more space. Calculators are OK but not needed. In answering the problems, you are not limited by the particular equipment you used in the laboratory exercises. Many formulae from the course have been provided for you on the last page. Partial credit can only be given if you show your work. FINAL EXAM GRADE : 1 __________ (20 max) 2 __________ (50 max) 3 _________ (40 max) 4 __________ (50 max) 5 _________ (40 max) TOTAL __________ (200 max) Spring 1996 EECS 145M Final Exam page 1 S. Derenzo/P. Hughett

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Initials Problem 1 (total 20 points): A student has a computer with an analog output port with a 12-bit D/A converter that has an output range from 0 to 5 volts. The student attempts to produce a triangle wave that rises from 0 V to 5 V, then falls to 0 V, then rises to 5 V, then falls to 0 V, etc. by sending the following sequence of numbers to the D/A: 0, 1, 2, . . ., 4999, 5000, 4999, . . ., 2, 1, 0, 1, 2, . . ., 4999, 5000, 4999, . . ., 2, 1, 0, etc. a. (10 points) Sketch the waveform actually produced at the analog output port (ignore the tiny steps that correspond to the D/A output steps). Label the vertical axis, but do not worry about the time axis. b. (10 points) Show how you could improve on what the student did. Spring 1996 EECS 145M Final Exam page 2 S. Derenzo/P. Hughett
Initials Problem 2 (50 points) Interface an analog data conversion circuit (Figure 1) to the digital input port of a microcomputer. The analog data conversion circuit has the following features: S/H input A/D conversion is started with a low-to-high edge A/D conversion complete is signaled with a high-to-low edge (and reset to high when the A/D start conversion is reset to low) S/H HI = Hold, LO = Sample Analog input A/D Convert Conversion complete Data Figure 1 Analog data conversion circuit, using a sample and hold amplifier and an A/D converter. The digital input port (similar to the one used in the 145M laboratory exercises 3, 8, and 9) has the

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Electrical Engineering 145M - Spring 1996 - Derenzo - Final...

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