Conduction in metals metals are filled with electrons. Theory of transistors and other semiconductor devices 1. The bjt is biased with a current source with high output impedance and a capacitor connects the emitter to ground. Ptype silicon, diode, water analogy of diodes, diode applications, transistor, transistor types, bjt types, npn bjt, bjt water analogy, npn transistor in a complete circuit, jfet, optoelectronics, led 101, visiblelight led, tricolor led, photoresistors, photodiode. The middle section base is narrow and one of the other two regions emitter is heavily doped. Power electronics nptel online videos, courses iit. Chitralekha mahanta, department of electronics and communication engineering,iit guwahati.
Lecture series on electronics for analog signal processing i by prof. Here we share with you the basics of transistor pdf. Tech in cse, mechanical, electrical, electronics, civil available for free download in pdf format. If you are finding the complete basic transistor notes pdf then you are at right place. The goal of this text, as its name implies, is to allow the reader to become proficient in the analysis and design of circuits utilizing discrete semiconductor devices. Bjt circuit configurations, bjt design, base resistance and emitter current crowding in bjts, punchthrough breakdown in bjts, gummelpoon bjt equivalent circuit accounting for the leakage currents. Which videos of nptel are a must watchbest for ece. Gate preparation, nptel video lecture dvd, electronicsandcommunicationengineering, electronicdevices, powerbjt, pn junction diode, pn junction, diode, current equations, diffusion current, drift current, bias characteristics, forward bias, reverse bias, switching characteristics. Analog electronics best lecture notes class notes pdf free download.
The input current i b and output voltage v c are chosen as the independent. I junction field effect transistor exam study material for. Bjt applications, feedback amplifiers and oscillators. When an electric field is applied, the electrons move in the direction opposite. Nptel provides elearning through online web and video courses various streams. Since an integrated circuit is constructed primarily from dozens to even millions of transistors formed from a single, thin silicon crystal, it. Bipolar junction transistor as a switch iosr journals. Basic electronics nyu tandon school of engineering. Lecture notes microelectronic devices and circuits. It is a semiconductor device and it comes in two general types.
Lecture notes, classroom notes ppt, engineering exam notes. Electronic devices power bjt exam study material for gate ece. The gain is a strong function of both temperature and bias current, and so the actual gain is somewhat unpredictable. Bjt as an amplifier, bjt as a switch, transistor switch circuit to switch onoff an led and a lamp in a power circuit using a relay refer 4. Radhakrishna rao, department of electrical engineering,iit madras.
Gate preparation, nptel video lecture dvd, electronicsandcommunicationengineeringelectroniccircuits, i, junctionfieldeffecttransistor, rectifiers, filters, dc load line, load line, operating point, bipolar junction transistor, biasing methods for bjt, bjt design stability, bias compensation, thermal stability, biasing, biasing for jfet, junction field effect transistor, biasing. Notes on the field effect transistor fet the fet is a three terminal device like the bjt, but operates by a different principle. Consider this simple circuitlab sketch of a circuit a current source. Transformer dc machines induction machine power system power electronics analog electronics prof. The three terminals of the bjt are the base, the collector and the emitter. Electrical engineering analog electronic circuits nptel. Lecture 24 mosfet basics understanding with no math reading. Biasing the field effect transistor transductance curves. In this website, we already cover almost all topics related to transistor if like to read it then simply go to the transistor category section and read all articles related to the transistor. It progresses from basic diodes through bipolar and field effect transistors. To drive the hparameter model for a transistor, we consider the basic ce amplifier circuit of figure 1.
A voltage v e then leaves the emitter and enters the circuit of which the npn transistor is a component. A bipolar junction transistor or bjt is a fundamental electronic component because of its expansive. I have written only those lectures which i found important and which are in the gate syllabus. A pn junction is the simplest form of the semiconductor diode. A bipolar junction transistor is a three terminal semiconductor device consisting of two pn junctions which is able to amplify or magnify a signal. Nptel video lectures, nptel online courses, youtube iit videos nptel courses. Fernandes, department of electrical engineering,iit bombay. Bipolar junction transistors bjt general configuration and definitions the transistor is the main building block element of electronics. A signal of small amplitude if applied to the base is available in the amplified form. Find materials for this course in the pages linked along the left. Two predominate transistors today include bipolar junction transistors bjt and metaloxidesemiconductor field effect transistors mosfet. Class lecture notes pdf download for engineering students. Analog electronics class lecture notes pdf download for gate ece engineering textbook mcqs online test ebook study material syllabus important questions.
Module 2 lecture 3 biasing the bjt lecture series on basic electronics by dr. When bell labs had an informal contest to name their new invention, one engineer pointed out that it acts like a resistor. Transistor small signal amplifiers can be considered linear for most application. The nptel site contains video lectures from faculty at iits and iisc. Bjt common emitter amplifier analog electronics course. The three terminals are called the source, drain, and gate. These lecture notes is very useful for engineering students exam.
Here we will describe the system characteristics of the bjt. During forward bias, escaping electrons are drawn to the positive base. Vlsi technology online course video lectures by iit madras. Transistors, used to amplify and switch signals, heralded the modern electronics era. The transductance curve of a jfet is a graph of output current i d vs input voltage v gs as shown in fig. Small signal models are only useful for forward active mode and thus, are derived under this condition. The values of i2 and i3 are dramatically di erent than the ones obtained earlier. A bjt is not the same as two diodes connected backtoback although it does have two pn junctions. Basic electronics mosfet fets have a few disadvantages like high drain resistance, moderate input impedance and slower operation. Mosfet offers advantages over bjt in modern electronics and computers. Transistors are three terminal active devices made from different semiconductor materials that can act as either an insulator or a conductor by the application of a small signal voltage. The aim of this project was to improve the quality of engineering and scie. Bjt transistor modeling a model is an equivalent circuit that represents the ac characteristics of the transistor.
These notes has been made by me after watching nptel lectures given by various professor from different iits and iisc. Feedback amplifiers principle, properties and advantages of negative feedback, types of feedback, voltage. Bjt amplifier circuits pdf 23p this note covers the following topics. The base current i b controls the collector current i c regions of bjt operation. Im not sure how to calculate the power dissipation across the transistor. Bjt transistor modeling, ce fixed bias configuration, voltage divider bias, emitter follower, cb configuration. The bipolar junction transistor bjt is an active device. In ideal conditions, this pn junction behaves as a short circuit when it is forward biased, and as an open circuit when it is in the reverse biased.
The variable i b, i c, v b v be and v c v ce represent the instantaneous total values of currents and voltages. Experiment 6 transistors as amplifiers and switches our final topic of the term is an introduction to the transistor as a discrete circuit element. Tech in electronics and communication engineering paper1 s. Experiment 6 transistors as amplifiers and switches. Small signal model of a bjt just as we did with a pn diode, we can break the bjt up into a large signal analysis and a small signal analysis and linearize the non linear behavior of the ebers moll model. The text is intended for use in a first or second year course on semiconductors at the associate or baccalaureate level. Lecture 24 mosfet basics understanding with no math. A model is the best approximate of the actual behavior of a semiconductor device under. Department of electrical engineering indian institute of technology madras lecture 33 bjt differential amplifiers continuing our discussion about differential amplifier, we saw in yesterdays lecture how. What is a signal and a system, classification of signals, properties ofsystems, noise. Many of these, typically one or two per atom in the metal, are free to move about throughout the metal. An npn transistor may have either a common base cb or a common emitter ce configuration, each with its own distinct inputs and outputs.