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One member of your team suggests that you use a circuit based on a comparator, the other member thinks you can use a DAC. Which one do you agree with? You should briefly explain what each of these circuits are and how you came to your conclusion. The thermocouple sensor you are using to measure the temperature operates in

One member of your team suggests that you use a circuit based on a comparator, the other member thinks you can use a DAC. Which one do you agree with? You should briefly explain what each of these circuits are and how you came to your conclusion. The thermocouple sensor you are using to measure the temperature operates in

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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You have been tasked to build an instrument that will indicate if the temperature of a sensor exceeds a specified value (X) by lighting up an LED. One member of your team suggests that you use a circuit based on a comparator, the other member thinks you can use a DAC. Which one do you agree with? You should briefly explain what each of these circuits are and how you came to your conclusion. (a) (b) The thermocouple sensor you are using to measure the temperature operates in the 1 to 1000HZ range and outputs a maximum voltage in microvolts the same as the last four digits of your matriculation number + 1000 (i.e. if your matriculation number is 1234567, the output voltage is 4567 + 1000 = 5567 uV) at the specified temperature X. You are concerned that this voltage is too small making it susceptible to noise. Therefore, you decide to amplify your signal by a factor of 1000. Sketch a circuit that employs an opamp to achieve this, including any necessary component values. The opamp you select has a noise characteristic of 20 nV/VHz - Calculate the signal to noise ratio of your signal after amplification. (c) (d) You are concerned that, if the temperature you are measuring sits close to the reference temperature X for a long time, the LED light will continuously flicker on and off because of this electrical background noise. Explain why this may be the case. You may wish to include a sketch of the input and output voltages of the circuit you selected in (a) above. (e) The object that your thermocouple is attached to has a very high heat capacity. Therefore, you are confident that it will not change temperature any more quickly than 5Hz. Sketch a possible modification you could make to your instrument's circuitry to help prevent the light flickering due to background noise. Explain how this would help.
Transcribed Image Text:You have been tasked to build an instrument that will indicate if the temperature of a sensor exceeds a specified value (X) by lighting up an LED. One member of your team suggests that you use a circuit based on a comparator, the other member thinks you can use a DAC. Which one do you agree with? You should briefly explain what each of these circuits are and how you came to your conclusion. (a) (b) The thermocouple sensor you are using to measure the temperature operates in the 1 to 1000HZ range and outputs a maximum voltage in microvolts the same as the last four digits of your matriculation number + 1000 (i.e. if your matriculation number is 1234567, the output voltage is 4567 + 1000 = 5567 uV) at the specified temperature X. You are concerned that this voltage is too small making it susceptible to noise. Therefore, you decide to amplify your signal by a factor of 1000. Sketch a circuit that employs an opamp to achieve this, including any necessary component values. The opamp you select has a noise characteristic of 20 nV/VHz - Calculate the signal to noise ratio of your signal after amplification. (c) (d) You are concerned that, if the temperature you are measuring sits close to the reference temperature X for a long time, the LED light will continuously flicker on and off because of this electrical background noise. Explain why this may be the case. You may wish to include a sketch of the input and output voltages of the circuit you selected in (a) above. (e) The object that your thermocouple is attached to has a very high heat capacity. Therefore, you are confident that it will not change temperature any more quickly than 5Hz. Sketch a possible modification you could make to your instrument's circuitry to help prevent the light flickering due to background noise. Explain how this would help.
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