fq_f10 - Page 1 Score = EEL 4744C – Dr. Gugel Print Your...

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Unformatted text preview: Page 1 Score = EEL 4744C – Dr. Gugel Print Your Last Name _____________________________________________________ Fall Semester 2010 Final Quiz Print Your First Name ____________________________________________________ • Open book/open notes, 70 minute examination. Calculators are permitted. No laptops or cell phones. iPADs allowed. Page 1 17 points _________________ Page 2 17 points _________________ Pages 3 16 points _________________ TOTAL 50 points _________________ A/D Conversion A student would like to digitize the output of an infrared sensor that the specifications say under typical usage has an output swing from 0.7 to 4.3V when driven with Vcc = 5V and Vss = GND. 1. If a 12 bit Unsigned A/D (with Vcc = 5V and Vss = GND) is used to digitize the signal what should the references for the A/D be set at for maximum accuracy? (2 pt.) Vref_high = ______________________________ Vref_low = _____________________________ 2. In #1 above if the references are set to 5V and GND what is the expected accuracy? (3 pt.) Show all your work. 3. Again if the references are set to 5V and GND on the 12 bit Unsigned A/D what are the expected digital outputs of the A/D in decimal assuming the following input voltages? (4 pt.) 2.5V is observed on the input pin of the Unsigned 12 bit A/D = ________________________________ decimal output 3.75V is observed on the input pin of the Unsigned 12 bit A/D = ________________________________ decimal output 4. For the infrared signal swing of 0.7 to 4.3V , what is the expected range of digital outputs in decimal assuming no noise in the system? Assume references of 5V and GND as before. (4 pt.) 5. For the infrared signal swing of 0.7 to 4.3V , what is the expected range of digital outputs in decimal assuming 50mV peak to peak noise in the system? (4 pt.) Page 2 Score = 6. For the previous infrared sensor with the 0.7 to 4.3V signal swing, if the student decides to use our DSP board to 6....
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fq_f10 - Page 1 Score = EEL 4744C – Dr. Gugel Print Your...

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