WEEK 1:Monday & Wednesday: Lectures

ECE302; Electronic Circuits

P-N Junction:1. Fundamental concepts2. P-N Junction

Where to find ECE302 materials;

• Simple to Basic; Khan Academy

• Basic to Advanced: MIT OCW• Other websites• Pictures/Videos on the web

Hands-on Demos:

Friday; questions/quiz

Download Course Materials:D2L and/or https://www.egr.msu.edu/nsferc/ECE302/

Unique Features of ECE302: Hands-on demos explain devices and electronic circuits.LEGOs based demos are unique in the world.Use of smartphone Apps for understanding electronic circuits.Weekly quizzes; open book and open Internet, answer on D2L.Best device/circuit web resources; Khan Academy, MIT OCW, etc.No textbook or e-book needed.Creative group learning approach; focus on underlying concepts.

Important Note: Learn how to use D2L as you will enter yourweekly quiz answers directly on D2L.

Questions:What is creative group learning?

Group Learning:1) Learning Using Creative/New Ideas; Discover Your Creativity and

Share Your Creative Findings with Class and Instructor.2) Smartphone Circuit Simulation; iCircuits, EveryCircuit, etc. 3) Different Accents in Videos Lectures Worldwide; Why is it

Important to Know Accents? Globalization of Industry. 4) Write a 5 page Group Activities Report.

D2L Login; setup needed.

Understanding P-N JUNCTION; Hands-on Demo:

R

Is each diode same for all the five junctions shown in the adjacent figure? Explain why?

Questions

Why is p-n junction involved in so many devices?

Fundamentals: Semiconductor . . . A key material

http://www.youtube.com/watch?v=mPGusBmm3XE

P-N Junction: What is built-in potential, Vbior ɸo?

ɸ

QuestionsWhat is built-in potential?Why is it so important?

DriftDiffusion

ɸₒ is built-in Potential (Vbi); it is due to fixed acceptors and donors causing carrier drift opposing majority carrier diffusion across the junction Can Vbi (ɸo) be measured using a

voltmeter? What is the source of Vbi? Why is E-field negative (directed from n to p)?

Questions

For forward bias, can the voltage drop across junction region exceed the Vbi? Explain why?

What is charge depletion? Why is it important?

Junction Formation;

t = 0; Vbi=0

t > 0; Vbi < ɸₒt = ∞; Vbi = ɸₒ

Why do they stop diffusing at t = ∞?

Because drift and diffusion currents become equal? https://www.youtube.com/watch?v=Lj6Y6JCu‐l4

Why don’t you meet me in the middle?

Wednesday Lecture

P-N Junction I-V:

Is Vbi measureable by a voltmeter?Is Vbi due to electrons and holes?What role does Vbi play in a p-n junction?Is Vbi same for all the five junctions shown in the adjacent figure? Explain why?

QuestionsKhan Academy

Diode I-V; https://www.khanacademy.org/science/electrical‐engineering/ee‐semiconductor‐devices/ee‐diode/a/ee‐diode‐circuit‐element

Khan Academy

Diode As Rectifier

Role of capacitor in rectifier?

Rectifier: Hands-on Demos1. Why use LED? 2. Are LEDs used in actual

rectifier circuits? 3. How to analyze rectifier

using PSPICE or other software?

https://www.google.com/search?q=full+wave+rectifier+circuit+diagram&tbm=isch&ved=2ahUKEwj364L8xrvmAhUVQqwKHURCBToQ2‐cCegQIABAA&oq=fullwave+rectifier&gs_l=img.1.1.0i67l2j0i10l8.41960646.41976632..41983758...1.0..0.125.1974.16j5......0....1..gws‐wiz‐img.......0j0i30j0i5i30j0i8i30.MtbKRUSApxc&ei=bjL4Xff8BpWEsQXEhJXQAw&bih=553&biw=1066&rlz=1C1GCEB_enUS831US831#imgrc=SErQ6KSLFlcrfM 

P-N Junction as Rectifier: Input is AC but the output is DC

Half Wave Rectifier

Full Wave Rectifier

- Role of transformer in rectifier?

- How to analyze rectifier using PSPICE or Smartphone App?

Friday Lecture

Role of capacitor in rectifier?

Role of transformer in rectifier?

QuestionsIs Vbi due to electrons and holes?What role does Vbiplay in a p-n junction?Is Vbi same for all the five junctions shown in the adjacent figure? Explain why?

What is charge depletion? Why is it important? Can Vbi (ɸo) be measured using a voltmeter? What is the source of Vbi? Why is E-field negative (directed from n to p)? For forward bias, can the voltage drop across junction region exceed the Vbi? Explain why? Why is p-n junction involved in so many devices? Why use LED? Are LEDs used in actual rectifier circuits? How to analyze rectifier using PSPICE or smartphone based Apps?

Group Learning Update

Friday Quiz

http://denethor.wlu.ca/PSpice/pspice_tutorial.html