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mt_sol(1)

# mt_sol(1) - Name Solution Real Time Computing Systems EE...

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Name Solution Real Time Computing Systems EE 4770 Midterm Examination 18 March 1998, 7:30-9:30 CST Alias Solution Problem 1 (35 pts) Problem 2 (30 pts) Problem 3 (35 pts) Exam Total (100 pts) Good Luck!

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Problem 1: Design a system to convert temperature, x [150 K , 300 K], to a floating point number, temp = H ( x ) = x/ K, using the new Transducer Z. An algebraic model function for the new Transducer Z is not available but a lookup table, HtZ , is. Table HtZ is a 4096-element array which stores the resistance of the sensor in ohms from a temperature of 100 K ( HtZ[0]=870 ) to 400 K ( HtZ[4095]=6500 ). (The temperature range covered by the lookup table is larger than is needed for this problem.) The relationship between the array index and temperature is linear. (The relationship between temperature and resistance is not linear.) An inverse table, HtZi is also available; element zero, HtZi[0]=100 , gives the temperature in Kelvins when the resistance is 870 Ω and HtZi[4095]=400 gives the temperature when the resistance is 6500 Ω. The relationship between array index and resistance is also linear. The resistance of the new Transducer Z is 1200 Ω at 150 K and 5000 Ω at 300 K. ( a ) Design the conditioning circuit and interface routine. If the gain/offset amplifier is used, the solution can show values for A 5 and O 5 instead of each resistor and voltage source, otherwise show all component and supply values. Show the code for any specialized procedures called. The design should use a 12-volt, 16-bit ADC and make full use of its dynamic range. Use interpolation to attain maximum precision.
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mt_sol(1) - Name Solution Real Time Computing Systems EE...

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