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Unformatted text preview: Page 1 Score = EEL 4744C Dr. Gugel Print Your Last Name _____________________________________________________ Fall Semester 2009 Final Quiz Print Your First Name ____________________________________________________ Open book/open notes, 60 minute examination. Calculators are permitted. No laptops or cell phones. iPods optional. Page 1 18 points _________________ Page 2 20 points _________________ Page 3 12 points _________________ TOTAL 50 points _________________ A/D & D/A Conversion A student has a vibration sensor where the output swings between +/- 4V . Assuming they use standard 9V batteries and voltage regulators to generate +/-5V references for a 14 bit Signed A/D , answer the following questions: 1. What is the smallest voltage change that can be measured by the A/D converter assuming zero noise? (2 pt.) 2. What is the expected accuracy of the analog conversion system? (2 pt.) 3. What is the digital value (in Hex ) expected for a +3V analog signal? (3 pt.) 4. If the analog sensor output has significant energy in the band from 1-10K Hz, what should the sampling frequency be if no low pass filter is used before A/D conversion? (2 pt.) 5. What is the digital value (in Hex ) expected for +3V if it was an unsigned A/D? (3 pt.) 6. What is the ideal theoretical dynamic range of the A/D in dBs? (2 pt.) 7. The student connects an oscilloscope to the A/D reference pins and observes +/- 100 mV of noise superimposed on the DC values. How many bits will be corrupted by this noise and what is the new dynamic range ? (4 pt.) Page...
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This document was uploaded on 11/24/2010.
- Spring '09