Download EE215, Assignment 9

EE215, Assignment 9
Week of November 30, 2015
This assignment is to be completed in groups of four students each. Each student will be required to lead the
completion of one problem and to fill out a meaningful peer review for the performance of other group members. This assignment is due no later than Monday, December 7, 2015 at 11:59 p.m. The group leader (listed
below) should submit the assignment as one complete .pdf document (separate files will not be considered). Each
individual should also submit a peer review.
Problems will not only be graded on accuracy but also on professionalism, clarity, neatness, and completeness of
responses. Assignments that rely heavily on externally sourced graphics will receive poor scores. Use original
graphics when appropriate to clearly convey a point in the explanation of each problem.
Team Members: (List the Group Leader first)
Name (Last Name, First Name)
Quiz Section
E-mail Address
All submissions should be professionally word processed (no handwritten responses are allowed). Each
submitted assignment should consist of (a) this title page; (b) each problem description followed by the response
to the problem, in consecutive order.
Problem
Out of
1
25
2
25
3
25
4
25
Total
100
Actual
As the leader of this group, by typing my name below and submitting this assignment for my group to
EE215 Canvas, I certify that this submission is the original work of my group; no part has in whole or in
part been plagiarized or copied from another source. Circuit schematics are original and not copied
from another source. Graphical depictions of data and behavior are also original productions. All remaining graphics copied from another source are appropriately cited in IEEE format.
Type Name Here :
Problem #1
1
Design a Wheatstone Bridge whose resistor values are well matched to the needs of a particular resistive sensor
(photocell, thermistor, etc.) in an application that you define. Your circuit should produce an output voltage of
zero when the sensor is in its baseline condition. In your answer, include, in the following order:
a. A description of the application you choose for your Wheatstone bridge, including the sensor you chose to
use and the range of inputs to that sensor expected and justified for that application.
b. An original schematic of the Wheatstone Bridge circuit in its final design, with resistors and resistor values,
power supply and power supply values, and sensor clearly labeled.
c. A derivation of the output voltage vs. sensor resistance for the Wheatstone Bridge circuit, including a clearly
labeled conclusion providing the output voltage as a function of sensor resistance.
d. A clear, well-labeled, original graph of the input to the sensor vs. the output resistance for the range of operation you defined in your application.
e. A clear, well-labeled, original graph of the output voltage of the Wheatstone bridge vs. the sensor resistance
for the range of operation you defined in your application.
f. The datasheet of the sensor you chose for the Wheatstone Bridge design.
Problem #2
Design a 2 bit and 4 bit Flash ADC converter that converts a voltage ranging from 0 to 10 V to a digital (base 2)
equivalent. A 2-bit converter has two digital outputs which can have the following values: 00, 01, 10, 11. A
four-bit converter is similar but has four digital outputs whose values range from a base 2 equivalent of 0 to a base
2 equivalent of 15. In your answer, include, in the following order:
a. A clear and specific description of how the flash analog to digital converter (ADC) works using the 2-bit
design as the basis for your example.
b. The digital circuits (using AND, OR, NAND, NOR, etc.) required to convert the Flash ADC output to a base
2 equivalent. Do not worry about optimizing these circuits to the smallest number of components. To save
time, you can draw a single digital logic block for each block for each ADC design (the 2-bit converter and
the 4-bit converter) and use it to explain how such a block would be created for subsequent blocks in the design. Do not feel compelled to unnecessarily repeat digital logic blocks that are very similar.
c. An originally constructed schematic of the 2-bit and 4-bit Flash ADC clearly showing the reference voltage,
the resistor values, the comparators including acceptable power supply rails for the comparators (0 and 10V),
and other relevant parts of the design. This schematic does not need to include the digital logic in part b.
d. A table describing the output digital values (2-bit or 4-bit) for each range of possible input voltages for the
design. The table should include the digital output values of the comparators and also the binary (base 2
equivalent) digital values that will be generated by your digital logic gates.
Problem #3
Design a tutorial that describes how a Printed Circuit Board is manufactured, beginning with the schematic of a
desired circuit and ending with the patterned printed circuit board ready to be assembled or populated with components. You may provide a written tutorial (no more than two single spaced pages, not including graphics) or a
recorded powerpoint or similar multimedia tutorial (no more than 7 minutes in length). Single layer and multilayer designs should be covered. All work should be original (text, content, organization, etc.) and should rely on
graphics from another source only to the extent that they are necessary to support the explanation. Graphs that are
copied from another source must clearly support the explanation (or be redrawn to support the explanation at
hand). Avoid superfluous graphics or superficial explanations. This problem will be graded on the professionalism, accuracy, and clarity of the explanation/tutorial provided.
Problem #4
Design a tutorial that describes how a Printed Circuit Board is assembled, beginning with the patterned printed
circuit board and ending with the PCB that is delivered to the customer. Surface mount and thru-hole assembly
should be addressed including drilling of both reference and component holes. You may provide a written tutorial
(no more than two single spaced pages, not including graphics) or a recorded powerpoint or similar multimedia
tutorial (no more than 7 minutes in length). All work should be original (text, content, organization, etc.) and
should rely on graphics from another source only to the extent that they are necessary to support the explanation.
Graphs that are copied from another source must clearly support the explanation (or be redrawn to support the
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explanation at hand). Avoid superfluous graphics or superficial explanations. This problem will be graded on the
professionalism, accuracy, and clarity of the explanation/tutorial provided.
Together, Problem #3 and #4 should cover the entire PCB manufacturing process from start to finish. A suggested breakdown of Problem #3 and #4 is as follows:
Based on terminology from the following PCB tutorial website:
http://www.madehow.com/Volume-2/Printed-Circuit-Board.html
Problem #3
Making the substrate
Drilling and plating the holes
Creating the printed circuit pattern on the substrate
Attaching the contact fingers
Problem #4
Fusing the tin-lead coating
Mounting the components
Packaging
Quality Control
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