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)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Answer Part A
![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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7774564a-34a1-4465-afaa-8c7c69189b87%2F3ee7eb04-2b70-4ca3-abc1-34dd8278ff78%2Fkac7u09_processed.png&w=3840&q=75)
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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