EGRE 306 Lab 4 Spr 2020
EGRE 306 – Introduction to Microelectronics
Spring 2021
Lab 2 – Diode-Based Voltage Regulato
Due on Feb. 11
Using your knowledge of diodes, you will design, build, and test a voltage regulator.
Part I - Diode Characteristics
Work with your partner to experimentally determine the scaling factor, Is for two different diodes one signal diode (set Is = 6.916x10-14 A) and one red LED [set Is = 3.604x10-33 A). Recall:
Part II – Voltage Regulator DESIGN (1 per person)
Using your results from Part I, DESIGN a voltage regulator, using the schematic to the right, where D4 is an LED and diodes D1-D3 are the same type of diode.
The values of Vout and RL should be 2.2V and 150Ω respectively.
VCC should also be set to 5V.
Be sure to include your Vout and RL values in the introduction portion of your lab report.
Part III – Voltage Regulator Demonstration
Build the voltage regulator circuit shown above using Multisim. Use the R2 resistor value that you calculated in part II.
After verifying that the Vout value found is co
ect, take the following data:
· Vout when VCC increases or decreases by 10%
· Vout when RL is doubled
Part IV – Voltage Regulator Design/Simulation
Calculate the Is value for a diode that has a rating of 2.1mA at 0.7V, using the diode equation:
Design your voltage regulator, using ONLY that type of diode (no LED).
Simulate your design in Multisim, using a signal diode, setting the Is value of each diode to your measured Is value in part IV.
Use probes to measure the output voltage, demonstrating that your design works properly.
Then, in the simulation, record the following data (take screenshots to demonstrate that it worked properly).
· Vout when VCC increases or decreases by 10%
· Vout when RL is doubled
A copy of this page should be submitted with your lab report (digitally scanned)
Name: ____________________________ Partner:____________________
Signal Diode Data/Calculations: Is = _____________________
LED Data/Calculations: Is = _____________________
Voltage Regulator Calculations Vout = _____________ RL = _______________
R2 = ___________
Lab Report (One per person) The lab report should follow the format on Canvas. Assume that the audience for this report is an EGRE 306 student who didn’t complete the lab, but wants to know exactly what you did. He/she has been to class, so they are familiar with the concepts and the equipment that you use.
Your lab report should contain the following sections, in the order below. Be sure the label each of the sections.
1. Cover Page (see Bb for template)
2. Introduction to the lab: Explain what the purpose of this lab, overall, was (max of 2
paragraphs).
3. Background and Theory: This includes relevant background information which explains why your experiment worked the way that it did.
3. Procedure: This is an explanation of what you did, experimentally, in the lab. Do NOT include results in this section.
4. Experimental Results: This is where you present the results of your experiments (data tables, screenshots, graphs, etc.). In addition,
iefly explain your results.
5. Conclusion: This is where you write a summary of the experiment, including answers to all of the questions that were included in the lab handout.
To Be Included:
Specific items that you should include are:
Description of HOW you determined Is for each of the diodes.
Step-by-step explanation of how you determined the R2 value for your voltage regulator.
Results from Part III (regardless of whether it was co
ect or not).
For Part IV, include a description of how you made your calculations, how you set up the simulation and the simulation results. These can be included in the appropriate sections of the report by adding the following sections to your report:
Background/Theory (Part IV) – determining Is
Simulation Procedure (Part IV) – How you set up your simulation
Simulation Results (Part IV) – Results that demonstrate that your simulation
provides the co
ect output voltage
Discussion (Part IV) – Discuss why you think your Part III results were not
co
ect, and what you changed in Part IV to yield co
ect results.
Lab Report is due at the beginning of your next lab session (March 11).
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