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page 1 S. Derenzo NAME (please print) STUDENT (SID) NUMBER
UNIVERSITY OF CALIFORNIA, BERKELEY
College of Engineering Electrical Engineering and Computer Sciences
EECS 145M: Microcomputer Interfacing Lab
LAB REPORTS:
1 _________________ 2 __________________ 3 ___________________
8 _________________ 9 __________________ 10 ___________________
21 _________________ 22 __________________ 23 ___________________
24a _________________ 24b _________________ Total of top 4 Long Lab Grades Total of top 4 Short Lab Grades Lab Participation Mid-Term # Mid-Term # Final Exam Total Course Grade _______________ (400 max) _______________ (100 max) _______________ (100 max) _______________ (100 max) _______________ (100 max) _______________ (200 max) _______________ (1000 max)
COURSE LETTER
GRADE
Spring 2010 FINAL EXAM (May 11)
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. Partial credit can only be given if you show your work. FINAL EXAM GRADE : 1 __________ (15 max) 2 __________ (30 max) 3 __________ (30 max) 4 __________ (20 max) 5 __________ (65 max) 6 __________ (40 max) TOTAL __________ (200 max)
PROBLEM 1 (total 15 points) 1.1 (15 points) List the essential handshaking steps for the reliable transfer of digital data from one circuit or computer to another. PROBLEM 2 (total 30 points) 2.1 (15 points) Draw the block diagram for the 8-bit flash A/D converter, showing all essential components and interconnecting lines.
4 .2 (15 points) Draw a circuit for eliminating D/A output glitches. 4.3 (10 points) Describe how your circuit eliminates glitches in its output.
PROBLEM 5 (total 65 points): You have a sensor that when triggered produces a very weak signal with a frequency content from 1 Hz to 1 kHz. To see the signal you need an amplifier, but all amplifiers add random noise to the amplified signal. In this case the noise is much greater than the signal and extends from 0 Hz to 1 MHz but can be neglected above 1 MHz. To extract the signal, you trigger the sensor periodically 100 times, sample the amplifier output, and use Fourier analysis.
5.3 (15 points) Describe the output of the FFT. 5.4 (15 points) Describe how you would recover the data signal with the maximum signal to noise.
PROBLEM 6 (40 points) Design a computer-based system for the real-time tuning of musical instruments. Assume the following:
- You will develop the system using a computer with digital and analog I/O similar to the 145M lab.
- The user enters the desired frequency f and a frequency differential โ f in Hz using the keyboard
- There are 5 LEDs that light up depending on whether the note being played is 2โ f low, 1โ f low, in tune, 1โ f high, or 2โ f high. The user can then adjust the pitch of the instrument so that its frequency matches the desired frequency.
- You will use digital filters to determine which LEDs to light. 6.1 (15 points) Draw a block diagram of your system, showing and labeling all essential components, connections, and signals.
