ECED3201_Lab1_F2023_Rubric
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Electrical Engineering
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Dec 6, 2023
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ECED 3201: Introduction to Electronics
Fall 2023
1
ECED 3201 Introduction to Electronics - Fall 2023
LAB #1
–
The Semiconductor Diode Basics
Marking Rubric
Introduction
0.5
Q1.
2
Q2.
2
Q3.
1
Q4.
2
Q5.
2
Q6.
2
Q7.
2
Q8.
2
Q9.
2
Q10.
2
Conclusion
0.5
Total
20/20
General Notes:
•
Reports should be well formatted, with a suitable font / size and using appropriate
technical writing, and graphs should have / axes / units labelled, and pictures of scope
signals should be clear.
•
Answers can be short if they provide enough information to either answer a question or
draw a suitable conclusion.
•
Students were given a lot of choice as far as the number of data points to measure, and
specific resistor values to use. This will cause all reports to have similar, but different
voltage / current measurements.
•
The priority for marking is that students are observing the data and making conclusions.
•
If the data collected was wrong, but they observe that and comment on it, that question
can be awarded up to 100%. However, any lab with incorrect data collected can only get a
maximum of 90%.
Introduction (/0.5)
•
Students should have something written about the purpose of the lab, it can include
anything referring to diode measurements, rectifiers, RC-Time constants. If it is well-
written, and contains some technical content, they get full marks.
Q1- Measure I
D
for different values of V
D
and sketch the transfer function I
D
vs V
D
in your report.
(/2)
•
Students get 1 point for a graph showing the transfer function of the Si Diode, and
Schottky Diode for a total of 2 points. Graphs must have suitable title and axes labeled.
Q2- Find the equation of the obtained curve and deduce the value of the saturation current Is.
(/2)
•
Students should have used an exponential line-of-best-fit tool for the equation and
should say what the saturation
(𝐼
𝑠
)
is. 1 point for the Si Diode, and 1 point for the
Schottky
diode. I’m not too concerned with if the value is correct, just that they extract
the value from the line of best fit. This might appear on the graph in Q1.
ECED 3201: Introduction to Electronics
Fall 2023
2
•
Si-diode should be between 1E-08 -> 1E-12, and Schottky 1E-05 -> 1E-07. Here is an
example of how it can be found, this was done using simulation:
Q3- Compare Si and Schottky diodes in the forward and the reversed bias regions. (/1)
•
Students may or may not have a graph showing the RB region. If they do not, they
should make a comparison using a datasheet / online resource they have found.
•
Students get 0.5 marks for comparing the FB regions, specifically the
𝑉
𝐷
& 𝐼
𝑠
values.
They need at least 1 comparison between diodes. Comparisons must be based on data.
•
Students get 0.5 marks for comparing the RB regions, specifically leakage current.
Comparisons must be supported with their data or a datasheet.
1.
Circuits Using Silicon (Si) Diode
Q4- Connect a Si diode in series with a 1
KΩ
load resistor RL
(using a 10 KΩ potentiometer)
as
shown in Fig. 2. Apply at VS a sinusoidal signal of 10 Vpp at 200 Hz. Observe and record
(take a snapshot from the scope) the waveform of VS and VL and explain the operation of
this circuit. (/2)
•
Students get 1 mark for having a scope picture showing a sin wave as the input, and a
half-wave as the output since this is a half-wave rectifier. Amplitudes may vary, but if it
is a sin input, and half-wave output, it is a full mark.
•
Students get 1 mark for describing the operation of the half-wave rectifier.
Q5- Connect now a 1
F capacitor, CL, in parallel with RL in Fig 2 and observe, and record the
waveform of VL. Change RL
from 1 KΩ to 10 KΩ
and observe the effect on the waveform of
VL. Explain how the output is affected by the time constant RLCL. (/2)
•
Students get 1.5 points for having a minimum of two graphs. These graphs should show
a sin wave input, and then a decaying positive half-cycle. There should be some
difference in decay time from graph 1-2 and more graphs is fine. Below is a simulation
showing what one of the graphs could look like.
•
Students get 0.5 point for explaining that the larger the RC-time constant as
𝑅
𝐿
increases, the longer the decay period is.
ECED 3201: Introduction to Electronics
Fall 2023
3
Q6- Construct the circuit shown in Fig.3 using Si diodes. Apply at vS a sinusoidal signal with
frequency of 200 Hz with 16Vpp and DC offset = 0V. Record the waveforms of v
s
and vO in
your report and describe the functionality of this circuit. (/2)
•
Students get 1 point for having a scope graph like the simulation one below. It should
have 3 distinct regions; 1 where the output is lower than the input, 1 where output =
input, and 1 where the signal is clipped. As long as 2/3 of regions are correct, they get
full points.
•
Students get 1 point for identifying the regions and discussing the graph.
Q7- Use the instructions in Appendix B to plot v
S
versus v
O
on your scope and take snapshot for
your report. Verify the obtained results using hand calculation. (/2)
•
Students get 1 point for having a graph similar to the simulation graph shown below. It just
needs the right 3 distinct regions.
•
Students get 1 point for showing hand-calculations resulting in the correct transfer
function as shown below.
I can clarify calculations if required.
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