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# fq_f11 - EEL 4744C Dr Gugel Fall Semester 2011 Final Quiz...

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Page 1 Score = EEL 4744C – Dr. Gugel Print Your Last Name _____________________________________________________ Fall Semester 2011 Final Quiz Print Your First Name ____________________________________________________ Open book/notes, 60 minute examination. Calculators are permitted. No laptops, cell phones or wireless devices allowed. Page 1 13 points _________________ Page 2 18 points _________________ Page 3 10 points _________________ Page 4 9 points _________________ TOTAL 50 points _________________ A/D Conversion You are given a vibration sensor that has an output that spans from 2V - 5V . It has been attached to a 16 bit A/D that has references set at 0V and 6V . 1. What is the accuracy of the current system? (3 pt.) 2. Assuming that the vibration signals will be AC, what can be done to achieve the ideal best accuracy for the system? (2 pt.) _________________________________________________________________________________________________ _________________________________________________________________________________________________ 3. If the A/D is an unsigned 16 bit A/D and the input voltage is 2.785V , what is the expected output in Hex on the A/D's data lines? (4 pt.) 4. Repeat problem #3 for a signed 16 bit A/D . For a 2.785V input, what is the expected output in Hex on the A/D's data lines? (4 pt.)

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Page 2 Score = In the previous A/D application (Page 1 of this test), a student notices that the lower 7 bits of the unsigned A/D are bouncing between 0 and 0x7F when the input of 2.785V is applied to the input of the A/D . This is due to noise on the power supply rails and reference pins of the A/D. 5. Due to the above noise characteristics, what is the possible range of voltages that correspond to the reading taken when 2.785V is applied to the input? (4 pt.) 6. What is span of the noise in terms of voltage? (2 pts.) 7. What is the dynamic range of the unsigned A/D with the noise issue? (2 pt.) More A/D Conversion
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fq_f11 - EEL 4744C Dr Gugel Fall Semester 2011 Final Quiz...

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