It is a type of transistor that uses both electron and hole charge carriers. Analysis that replaces the transistor with a pair of batteries representing the two junction turn on voltages cvd model. Principles of modern cdma mimo ofdm wireless communicationscourse sponsored by aricent. We will spend some time understanding how they work based on what we know about pn junctions. Lecture 23 the bipolar junction transistor bjt video. The very first bipolar junction transistors were fabricated from a bar of germanium with two closely spaced alloyed contacts.
Bipolar junction transistor operation and modeling. Vlsi design nptel online videos, courses iit video lectures. Introduction to bjt bipolar junction transistor the. Lecture 7 bipolar junction transistors bjts guyeon wei. It is a currentdriven device mosfet is voltage driven, the output current is equal to the input current times a factor which is called gain. Start the animation by either clicking vce on, which applies a positive voltage to the collector of the transistor, or use your mouse to drag the vbe slider handle up to increase the voltage applied to the base.
This course is intended for the core courses in electronics circuits taught to undergraduates in electrical and computer engineering. Your browser does not currently recognize any of the video formats available. Here we will describe the system characteristics of the bjt. The bipolarbased power devices include highpower bipolar transistors, darlington transistors consisting of two transistors with a common collector, thyristors also called silicon controlled rectifiers srcs and triacs, a complementary thyristor. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Also known as silicon homojunction explanation of bipolar junction transistor. One way to look at a bjt transistor is two backtoback diodes, has very different characteristics. The objective of this course is to develop the ability to analyse and design electronic circuits both analog and digital, discrete and integrated. The early voltage va has a typical value of 150 volts. A bipolar junction transistor, or bjt, is a type of transistor in which the current flow between the collector and the emitter is controlled by the amount of current that flows through the base. The adobe flash plugin is needed to view this content. Basic construction, biasing and operation of npn and pnp type transistors. In this lecture, well introduce one of the fundamental analog devices.
In summary, during this lesson i introduced the bipolar junction transistor, a three terminal device that consists of two pn injunctions. Bipolar junction transistors emitter p n collector base pnp transistor emitter n p base npn transistor bipolar. Since an integrated circuit is constructed primarily from dozens to even millions of transistors formed from a single, thin silicon crystal, it might be interesting and instructive to. Since an integrated circuit is constructed primarily from dozens to even millions of transistors formed from a single, thin silicon crystal, it. As we have seen a semiconductor offers less resistance to flow of current in one direction and high resistance in another direction, we call the device made of semiconductors as a transistor. Jan 10, 2012 developed by shrinidhi kulkarni for sparsha learning technologies. There are two junctions in bipolar junction transistor. Radhakrishna rao, department of electrical engineering,iit madras. How a bjt bipolar junction transistor works its all in the doping the way a transistor works can be described with reference to fig. A bipolar transistor allows a small current injected at one of its terminals to control a much larger current flowing between two other terminals, making the device. Mar 15, 2020 as we will go through the topic, we will know about the transistor, mainly bipolar junction transistor or bjt. Introduction to bipolar junction transistor bjt slideshow.
Bipolar junction transistor article about bipolar junction transistor by. The twocarrier flow from 1 and 4 forms the emitter current ie. The bipolar junction transistor bjt is an active device. A bipolar transistor allows a small current injected at one of its terminals to control a much larger current. Experiment 6 transistors as amplifiers and switches. How to use bjt bipolar junction transistor beginners.
Each junction can be forward or reverse biased independently. In this first transistor lecture, well spend time applying our familiar semiconductor. Because of this, such junctions are very useful for operation at the frequencies as high as 10 ghz. Germanium was used since it could easily be purified such that the minority carrier diffusion length was comparable to the distance between the two alloyed contacts. Find out information about bipolar junction transistor. It is a semiconductor device and it comes in two general types. Bipolar junction transistor structure qualitative description of operation.
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. Power bipolar junction transistor bjt background the bipolar junction transistor was invented in 1947 by shockley, brattain, and bardeen. Introduction to bipolar junction transistor bjt youtube. Introductionintroduction the basic of electronic system nowadays is semiconductor device. It is an electronic component mainly used for amplification and switching purpose. We will begin looking at transistors with the bipolar junction transistor. Bipolar junction transistor 1 tutorial of solid state devices iit madras course by prof s. Vlsi design nptel online videos, courses iit video.
Bipolar junction transistors the transistor is a threelayer semiconductor device consisting of either two n and one p type layers of material or two p and one n type layers of material. Today, i am going to discuss the details on the introduction to bjt bipolar junction transistor. Upon completion of the presentation you will be able to understand. The topic to be covered in this video is bipolar junction transistors from analog electronics. Bipolar junction transistors bjt and its applications. Smith context in fridays lecture, we discussed bjts bipolar junction transistors today we will find large signal models for the bipolar junction transistor, and start exploring. Basic operation of bjt bipolar junction transistor. The invention of the bipolar transistor in 1948 ushered in a revolution in electronics. The operation of the transistor is very dependent on the degree of doping of the various parts of the. Sep 01, 2008 lecture series on electronics for analog signal processing i by prof. Bipolar junction transistors tlt8016 basic analog circuits 20052007 3 basic operation in the active region figure 4. Or a transistor is a device that regulates current or voltage flow and acts as a switch or gate for electronic signals. May 11, 2018 today, i am going to discuss the details on the introduction to bjt bipolar junction transistor.
Developed by shrinidhi kulkarni for sparsha learning technologies. Unipolar transistors, such as fieldeffect transistors, use only one kind of charge carrier. Transistor basics the bipolar junction transistor pdf currently this section contains no detailed description for the page, will update this page soon. Bipolar junction transistors tlt8016 basic analog circuits 20052007 12 4. Introduction, semiconductor, equilibrium carrier concentration, carrier transport, excess carriers, pn junction, procedure for device analysis, bipolar junction transistor bjt, metaloxidesemiconductormosjunction, mos field effect transistor mosfet. The word transistor is derived from the words transfer and resistor it describes the operation of a bjt i. Transistor action baseemitter junction is forward biased and collectorbase junction is reverse biased. Bjt bipolar junction transistor construction, types and. A bipolar junction transistor bjt has three terminals connected to three doped semiconductor regions. Bipolar junction transistors pdf 46p download book. Technical feats previously requiring relatively large, mechanically fragile, powerhungry vacuum tubes were suddenly achievable with tiny, mechanically rugged, powerthrifty specks of crystalline silicon. Introduction to bipolar junction transistor bjt basic transistor bias and operation.
Transistors consist of three layers of a semiconductor material, each capable of carrying a current. Ee5310 analog electronic circuits video course iit madras. Mosfet metaloxidesemiconductor fieldeffect transistor. Bjt bipolar junction transistor tutorial of basic electronics i course by prof r. Department of eecs university of california, berkeley eecs 105fall 2003, lecture 14 prof. Lecture 3 bipolar junction transistor bipolar junction. This name is a representation for a device having transfer resistors. A bipolar junction transistor or bjt is a three terminal electronic device that amplifies the flow of current. Semiconductor materials, rectifier circuits, clipping and clamping circuits, bjt, mosfet, jfet, bjt small signal analysis, bipolar junction transistor amplifier, small signal model of mosfet, junction field effect transistor, operational amplifier opamp, opamp applications, large signal amplifiers, positive feedback and oscillation, silicon control rectifier and scr applications. Ppt bipolar junction transistors powerpoint presentation.
A bipolar transistor that is composed entirely of one type of semiconductor, silicon. The two diode model of a transistor is ok if you want to identify which is the base lead with a multimeter, but it leaves out too much behaviour to be useful beyond that. Solid state devices iit madras online course video lectures. Radhakrishna rao, department of electrical engineering,iit madras nptel electronics free video lectures, courses, tutorials, classes, clips electronics lectures from mit, stanford. Lecture series on electronics for analog signal processing i by prof. A circuit simulation package will be made available as free download to enable students to simulate circuits covered in. The availability of singlecrystal silicon technology with higher purity levels together. Background we will begin looking at transistors with the bipolar junction transistor. Bipolar junction transistor 1 video lecture by prof s. Basic electronics online course video lectures by iit guwahati. Equivalent to an off state when transistor is used as a switch. Although the transistor has two junctions, it is the way the junctions interact through their thin common layer that makes a.
Smith department of eecs university of california, berkeley eecs 105 spring 2004, lecture 22 prof. Bipolar power devices are the traditional power devices because of their capability to provide high currents and high blocking voltages. Download bipolar junction transistors pdf 46p download free online book chm pdf. A bipolar junction transistor bipolar transistor or bjt is a type of transistor that uses both electrons and holes as charge carriers.
Bjt bipolar junction transistor are widely used an amplifier, oscillator, switch etc. Microelectronics online course video lectures by iit roorkee. Introduction, semiconductor, equilibrium carrier concentration, carrier transport, excess carriers, pn junction, procedure for device analysis, bipolar junction transistor bjt, metaloxidesemiconductormos junction, mos field effect transistor mosfet. Experiment 6 transistors as amplifiers and switches our final topic of the term is an introduction to the transistor as a discrete circuit element. Bipolar junction transistor physics and radioelectronics. As we have seen a semiconductor offer less resistance to flow current in one direction and high resistance is another direction and we can call transistor as the device mode of the semiconductor. The base current i b controls the collector current i. In this video, the bipolar junction transistor, its different region of operation, different configurations and the working is briefly explained. Lecture 3 bipolar junction transistor free download as powerpoint presentation. Apart from that you can get to know about the basics of bipolar junction transistor. Transistor basics the bipolar junction transistor pdf currently this section contains no detailed description for. The famous and commonly use of this device is bjts bipolar junction transistors. Also includes some basic characteristics and parameters of the bjt.
Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. In an npn transistor, a thin and lightly doped ptype base is sandwiched between a heavily doped ntype emitter and another ntype collector. As the name suggests, it is composed of two junctions called emitterbase junction and collectorbase junction. The multifold advantages of replacing vacuum tubes with a solidstate device rapidly promulgated its use in applications. The base current i b controls the collector current i c regions of bjt operation. As we will go through the topic, we will know about the transistor, mainly bipolar junction transistor or bjt. Boring analysis that removes the transistor from the circuit leaving an open circuit. Bjt bipolar junction transistors and hbjt heterojunction bipolar junction transistors to take. Methods of transistor biasing s bharadwaj reddy august 14, 2016 september 27, 2016 in the interest of simplicity and economy, it is desirable that transistor circuit should have a single source of supplythe one in the output circuit i. The point contact junction has very low value of the capacitance. Nptel online videos, courses iit video lectures well organized. The bipolar junction transistor is a semiconductor device which can be used for switching or amplification in the diode tutorials we saw that simple diodes are made up from two pieces of semiconductor material to form a simple pn junction and we also learnt about their properties and characteristics. Bipolar junction transistors learn about electronics.
Bipolar junction transistors types of bipolar junction transistors. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. One way to look at a bjt transistor is two backtoback diodes, has very different. Ppt bipolar junction transistors powerpoint presentation free to download id. Bipolar junction transistor article about bipolar junction. Bipolar junction transistorbipolar junction transistor bjtbjt chapter 3 2. Bipolar junction transistors bjt general configuration and definitions the transistor is the main building block element of electronics. In bipolar junction transistor, electric current is conducted by both free electrons and holes. Lecture notes microelectronic devices and circuits electrical.