Welcome to the video lecture series of electronic devices. This is the introductory lecture. Subject name is electronic devices.
So you must be very much curious that what you are going to study in this subject. This subject deals with the understanding of electronic devices. Many of devices you encounter in your daily life like TV, mobile phones, camera, extreme machines, projectors, so many things are available over there.
So in this session, I am going to explain you what is the course content and what is the course outcome. So here is one more term course outcome. Course outcome you can understand as after the completion of each and every unit or module what you are going to learn that is the course outcome. So in this subject which is electronic devices there are five units and corresponding to each and every unit there is one course outcome. Let us begin today's lecture.
What is electronics? Electronics is the branch of physics and technology concerned with the design of circuits using transistor, microchips and with the behavior and movement of electrons in a system. semiconductor, conductor, vacuum or gas. Electronics deals with the emission, flow and control of electrons in vacuum or matter. So why do we should study this particular subject?
You have to study because if you are able to learn about electronics basics means you can apply your knowledge for the manufacturing, working principle and ability to make your own circuits. What are electronic devices? An electronic device is a device that made by utilizing and controlling the laws of electron motion in a vacuum, gas, or solids. So, depending upon it, all electronic devices can be divided into three categories.
First is electric vacuum devices, second is gas tube devices and third is solid state electronics. First unit, in the first unit is you have to study about the semiconductor physics where there is a revision of quantum mechanics you have studied in past as well. and electrons in periodic lattice EK diagram. So this is all about you have to study over here but if you see you can find two terms one is semiconductor physics and other is quantum mechanics.
So first let us understand what is semiconductor physics. Semiconductor physics you can understand as it is defined as the study of the material that are important for modern technology. What is quantum mechanics? Quantum mechanics is the branch of mechanics that deals with the mathematical description of motion and interaction of subatomic particles. This quantum mechanics includes the concept of quantization of energy, wave particles, duality, the understanding principle and correspondence principle.
So this is all about the quantum mechanics. I've just given you a like a brief about these two diagrams what you are going to study say this is a lattice structure and EK diagram. I'll explain each and everything in detail.
So what is the course outcome of this unit? after the completion of unit 1 you will be able to understand basic concepts of electronics and quantum mechanics so this is the course outcome of unit 1 moving ahead In unit 2, you have to study about the energy bands in intrinsic and extrinsic silicon, carrier transport, diffusion current, drift current, mobility, resistivity, design of resistors, these terms. So, I will be telling you in detail.
what is intrinsic and extrinsic semiconductors but briefly you can understand it as intrinsic is a pure semiconductor and extrinsic where some impurities be included. How the movements of electrons are possible accordingly you are going to study about the electron drift, electron diffusion and energy band diagram for insulator, semiconductor and conductors as have been mentioned in these two diagrams. So you have to study all about these things in unit 2. What is the course outcome of unit 2? After the completion of second unit you will be able to explain energy bands in semiconductors, drift current and diffusion current. Unit 3, it covers generation and recombination of carriers, Poisson and continuity equation, PN junction characteristics, IV characteristics and small signal switching models.
you know that there are some semiconductors and after adding some impurity extrinsic semiconductors can be formed and when you join p-type semiconductor with n-type then p-n junction can be formed so here in this unit you have to study about the pn junction diode diode has two terminals what is the current voltage characteristics of diode what is small signal switching model so all these things you have to study in this unit here in this diagram you can see that p type material is combined with n and this forms a pn junction diode and symbolically it is being represented in this form and in the second diagram you can see that a vi character characteristic curve have been shown. So you are going to study in detail. Course outcome of unit 3 after the completion of third unit you will be able to analyze p-n junction characteristics.
So this is the course outcome. Unit 4 is all about the types of breakdown. There are two possible types of breakdown, avalanche breakdown and zener breakdown. So, accordingly you have to study zener diode, Schottky diode, bipolar junction transistor.
Bipolar junction transistor in short is being written as BJT. You must have done several projects in your school time as well. So you know that BJT is a three terminal device and I will be telling you in detail how its mechanism. works and how the movement of electrons can take place and how can you represent it in the mathematical form what is the current voltage characteristics each and everything so in BJT since it is a three terminal device the three terminals are base collector and emitter One more thing you have to study that is Ebersmol model. What is this model?
This model is a simple and elegant way of representing the transistor as a circuit model. So you are going to study all these things. See in these diagrams, the second one, this is the symbolic representation of BJT where the three terminals base, collector and emitter have been shown. IB is base current, IC is collector current, IA is emitter current. In the first diagram you can see the three types of diodes symbols have been shown rectifier diode the pn junction diode you will be studying in the previous unit schottky diode zener diode you are going to study in this unit so the course outcome of unit 4 is after the completion of fourth unit you will be able to explain the breakdown mechanism and BJT you Moving further, fifth unit includes the concept of MOS capacitor, CV characteristics, MOSFET, IV characteristics, small signal model for MOS transistors, LED, photodiodes and solar cells.
See what is MOS? MOS is metal oxide semiconductor and MOSFET is metal oxide semiconductor field effect transistor. So you have to study in detail.
how these symbols can be represented, what are the current voltage characteristics and all about light emitting diode, photodiodes in solar cells. In these diagrams you can see this is the Like metal oxide semiconductor field effect transistor, four terminals are there, source, gate, drain. Here you can see photodiode, phototransistor and LEDs. You have seen various colors of LEDs in your day-to-day life.
So the course outcome of unit number 5 is after the completion of 5th unit, you will be able to explain the concept of MOSFET, its working and optoelectronic devices. So each and everything you have to study in detail. So this is all about the course content and course outcome for all the five units.
I'll be sharing lecture notes for each and every lecture as well and don't miss any of the video so that you are going to understand the whole subject very nicely. To study in detail, you can refer these books. Streetman, Solid State Electronic Devices, Devis, Semiconductor Physics and Devices, SMZ, CETISA.
So all these books are readily available on the internet. Sufficient number of copies must be available in your library as well. And rest of the things you can study from my notes and by watching video lectures.
So thank you students listening it patiently and don't miss the upcoming video lectures so that you will be able to understand the whole subject very beautifully and in a very systematic manner. Thank you all.