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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
icon
Related questions
Question

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.
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.
Expert Solution
steps

Step by step

Solved in 3 steps

Blurred answer
Knowledge Booster
State Variable Analysis
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Fundamentals of Electric Circuits
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:
9780078028229
Author:
Charles K Alexander, Matthew Sadiku
Publisher:
McGraw-Hill Education
Electric Circuits. (11th Edition)
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:
9780134746968
Author:
James W. Nilsson, Susan Riedel
Publisher:
PEARSON
Engineering Electromagnetics
Engineering Electromagnetics
Electrical Engineering
ISBN:
9780078028151
Author:
Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:
Mcgraw-hill Education,