Pnp, is exactly the same the only difference being. Video lectures created by tim fiegenbaum at north seattle community college. Lecture 24 mosfet basics understanding with no math. Hence comparing the schematic symbol to the pn junction in figure 4, we see the anode is the ptype semiconductor and the cathode is the ntype semiconductor. The circuit schematic symbol of a diode is shown in figure 5. Transistors now that we know about diodes, lets put two of them together, as follows. Bjt transistor modeling a model is an equivalent circuit that represents the ac characteristics of the transistor. The principle of operation of the two transistor types. Bipolar junction transistors emitter p n collector base pnp transistor emitter n p base npn transistor bipolar. All of the sizing calculations in this monograph compute the input capacitance of gates.
Alan doolittle lecture 24 mosfet basics understanding with no math reading. 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. This is a lecture series on semiconductor physics by prof. Smith department of eecs university of california, berkeley eecs 105 spring 2004, lecture 22 prof. Bipolar transistors are a three lead device having an emitter, a collector, and a base lead. In bipolar junction transistor bjt, both free electrons and holes conduct electric current whereas in field effect transistor fet either free electrons or holes conduct electric current. Vlsi technology online course video lectures by iit madras. Nptel analog electronics epub download pdfin website. Collector npn transistor pnp transistor p n p n p n. Electronics nptel online videos, courses iit video lectures. Basic electronics i online course video lectures by iit kharagpur. Sep 21, 2014 electronic materials, devices, and fabrication by prof s.
Basic coursessem 1 and 2 basic electronics and lab nptel. Nptel, online courses and certification, learn for free. Nand and nor gates would both have a logical effort of 1. High voltage dc transmission free electrical engineering online course on nptel by iit kanpur s. Diodes and transistors university of california, berkeley.
So, you want to download all of the video lectures for a course in nptel. Actually, even for zero emitter current there is a small reverse. The series begins with the basic concepts of the solid state physics and then goes into the theory of pn junction, bjt and mo. In terms of operation, this means that the base voltag. Electronic materials, devices, and fabrication by prof s.
Nptel provides elearning through online web and video courses various. Download pdf of nptel material offline reading, offline notes, free download in app, engineering class handwritten notes, exam notes, previous year questions, pdf free download. Lecture 24 mosfet basics understanding with no math reading. Ajit pal, computer science and engineering, iit kharagpur. Chitralekha mahanta, department of electronics and communication engineering. Metallurgy and material science materials and energy balance in metallurgical processes jun 3, 2019 0619 by national programme on technology enhanced learning. Module 3 lecture 2 metal oxide semiconductor field. Lecture notes microelectronic devices and circuits. A bipolar junction transistor bjt consists of three differently doped re gions. The currents in the base i b, collector i c and emitter i e are related as follows. Bipolar transistors transistors xist3 introduction bipolar transistors have the following characteristics.
Mos transistor qualitative description assume an nchannel receives its name from the type of channel present when current is flowing device with its source and substrate grounded i. Chitralekha mahanta, department of electronics and communication engineering,iit guwahati. These can have the configuration of npn or pnp and the various layers can either be. Digital applications transistors and transistor circuits. We will spend some time understanding how they work based on what we know about pn junctions. A very small amount of current flow emitter tobase base. I need the complete lecture of transistors and its working. Singh evolution of hvdc systems, comparison of hvac and hvdc transmission systems, components of hvdc transmission system, analysis of hvdc converters, hvdc control, maloperation and protection of converters, filter design, acdc load flow and stability analysis, multiterminal hvdc, different. Students will be introduced to mos transistors, their.
The transistors feature structures just 30 nanometers in size and three atomic layers thick. How to download all of the lectures for a course in nptel quora. Module 2 lecture 3 biasing the bjt lecture series on basic electronics by dr. Transistor biasing common emitter circuits, fixed bias, collector to base bias. Astable multivibrator circuit consist of two cross coupled rc amplifiers. We looked at hybrid, mosfets, cmos, totempole output. Parasuraman,department of metallurgy and material science,iit madras. Control signals were applied to the base of the commonemitter input to either have the transistor in the off condition the transistor in cutoff mode or on the transistor in saturation mode. Calculating the logical effort of gates 40 20 a x 30 30 30 30 x a b 48 48 12 12 a b x figure 4.
Simple gates with 60 input capacitance of 60 unitsized transistors. At first glance, this looks like an insulator but the actual behavior is far more interesting, if we apply external voltages properly n n p collector emitter base moderately doped lightly doped, and very thin heavily doped. The transistors are mainly classified into two types. For the love of physics walter lewin may 16, 2011 duration. Smaller transistors are faster, and fast transistors are the key building block for fast microprocessors, the brains of computers and countless other smart devices. In power electronics, where the main objective is the efficient control of power, transistors are invariably operated as switches.
Find materials for this course in the pages linked along the left. Bipolar transistors are current regulating devices that control the amount of current flowing through them in proportion to the amount of biasing voltage applied to their base terminal acting like a currentcontrolled switch. Lecture 1 introduction to semiconductors and semiconductor. Nptel video lectures, iit video lectures online, nptel youtube lectures. Learn for free, pay a small fee for exam and get a certificate. In the next section, were going to be looking at linear applications for transistors. High voltage dc transmission ee 488 by nptel on iit kanpur. Junction transistors bjts there are two types of bjts, the npn and pnp the two junctions are termed the baseemitter junction and the basecollector junction in order for the transistor to operate properly, the two junctions must have the correct dc bias voltages the baseemitter be junction is forward biased. One can think of the collector current as current which would normally flow from base to emitter. Nptel provides elearning through online web and video courses various streams. A model is the best approximate of the actual behavior of a semiconductor device under.
Transistor small signal amplifiers can be considered linear for most application. Nptel, an elearning initiative by the 7 indian institutes of technology and the indian institute of science with the support of the mhrd, govt. Downloads electronic systems, lecture 1, lecture notes, kb analog circuits about the course this course is an introduction to amplifiers using transistors students will be introduced to mos transistors, theirlecture 29. Some simple rules for getting transistors to work 1. Diode schematic symbol and actual picture of a common 1n914 diode the black stripe in the picture is the cathode. Module 2 lecture 3 biasing the bjt nptel basic electronics. This course is an introduction to amplifiers using transistors. Natarajan sunupradana lecture 9 zener diode characteristics duration. For npn pnp collector must be more positive negative in voltage than emitter. Bipolar junction transistor bjt and field effect transistor fet.
897 1182 1169 1602 602 978 307 1107 1270 121 1321 919 898 1257 937 282 515 1592 676 265 135 298 1274 111 317 798 309 977 1458 1376 852 888 279 521 1454 1162 1091 1300 482 255 1451 1378 498 1315 1310 848 271