BMEN
Exam1 Problem Set.docx

Exam1 Problem Set.docx - LAST NAME FIRST NAME SPRING 2018...

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LAST NAME: FIRST NAME: SPRING 2018 BMEN 3350.002 EXAM I PROBLEM SET 02/14/2017 1

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This problem set is designed to provide you with an opportunity to practice key concepts to be covered on Exam I. This practice problem set is approximately 2x as long as the actual exam. To best simulate exam conditions, allow yourself 2 hours and 30 minutes to complete this problem set the first time. Solutions will be posted on 2/21/17. 2
Problem 1: You are working with a load cell (force sensor) which outputs a voltage which varies linearly with applied force over a range of 0 – 10 Newtons. The output voltage varies from -1.4V (at 0 N) to -1.8V (at 10 N). Q1a: What is the sensitivity of the load cell (in V / N)? ____________________ Q1b: Design a circuit which scales the output of the load cell for an ADC with an input range of 0V – 3.3V. Assume that the only voltage rails available to you are 0V and 3.3V ( hint: you will need to use a summing amplifier ). Draw your completed circuit in the space below (show your work on the work pages at the end of the exam). Q1c: What is the sensitivity at the ADC input (in V / N)? _______________ Q1d: Using a 14-bit ADC, what is the resolution in N? ________________ 3

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Problem 2: You are working with a thermistor (temperature sensor) which exhibits a linear increase in resistance as temperature is increased within a range of 0°C to 50°C. At 0°C, its resistance is 8 kΩ, and at 50°C its resistance is 60 kΩ. Q2a: Design a voltage divider which limits the maximum current through the thermistor to less than 10 μA using power rails of 0V and 5V. Draw the voltage divider below. Q2b: What is the output voltage of your voltage divider when the temperature is 0°C? __________________ When the temperature is 50°C? _______________ Q2c: You measure the output voltage of your voltage divider and observe noise at 1 kHz with an amplitude of 5 mV. Assuming the temperatures you are measuring average ~25°C, what is the signal
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• Spring '17
• Voltage divider

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