The Case of Solid State Electronics at Stanford
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Thyristors.Pdf
THYRISTORS Electronic Devices, 9th edition © 2012 Pearson Education. Upper Saddle River, NJ, 07458. Thomas L. Floyd All rights reserved. Thyristors Thyristors are a class of semiconductor devices characterized by 4-layers of alternating p and n material. Four-layer devices act as either open or closed switches; for this reason, they are most frequently used in control applications. Some thyristors and their symbols are (a) 4-layer diode (b) SCR (c) Diac (d) Triac (e) SCS Electronic Devices, 9th edition © 2012 Pearson Education. Upper Saddle River, NJ, 07458. Thomas L. Floyd All rights reserved. The Four-Layer Diode The 4-layer diode (or Shockley diode) is a type of thyristor that acts something like an ordinary diode but conducts in the forward direction only after a certain anode to cathode voltage called the forward-breakover voltage is reached. The basic construction of a 4-layer diode and its schematic symbol are shown The 4-layer diode has two leads, labeled the anode (A) and the Anode (A) A cathode (K). p 1 n The symbol reminds you that it acts 2 p like a diode. It does not conduct 3 when it is reverse-biased. n Cathode (K) K Electronic Devices, 9th edition © 2012 Pearson Education. Upper Saddle River, NJ, 07458. Thomas L. Floyd All rights reserved. The Four-Layer Diode The concept of 4-layer devices is usually shown as an equivalent circuit of a pnp and an npn transistor. Ideally, these devices would not conduct, but when forward biased, if there is sufficient leakage current in the upper pnp device, it can act as base current to the lower npn device causing it to conduct and bringing both transistors into saturation. -
UW EE Professional Masters Program To
Electrical Engineering Fall 2007 The ntegrator In this issue UW EE Professional Masters Program To Dean’s Message 2 Chair’s Message 2 Commence In 2008 New Faculty 3 UW EE is pleased to announce the availability of an evening professional master’s degree Damborg Retires 3 in electrical engineering. The Professional Masters Program (PMP) is designed primarily Parviz Wins TR35 4 for the working professional employed locally in the Puget Sound to allow students the flexibility of working while pursuing an MSEE. Classes will be offered in the evening on In Memory 4 the Seattle campus and are scheduled to begin winter quarter 2008. “For the first time, Student Awards 5 the UW MSEE degree will be available in an evening format,” says Professor and Associ- New Scholarship 5 ate Chair for Education, Jim Ritcey. “The addition of an MS degree on your resume can be critical when seeking new opportunities.” Alumni Profile 6 Class Notes 7 Based on a comprehensive marketing survey carried out by UW Office of Educational Outreach, the PMP will initially focus on four curriculum areas. These include Controls, Electromagnetics, Signal and Image Process- Earn a MSEE In the Evening ing, and Wireless Communications. As the program matures, additional topic areas will Considered getting a MSEE but can’t quit your job? UW be available to PMP students. The program EE’s Professional Master’s Program allows you to keep your will meet the same high standard as the full- knowledge up-to-date in this fast moving field by working time degree, although the course content will vary. -
68 Chapter 9: Thyristors Thyristors Thyristors Are a Class Of
Electronic Devices Chapter 9: Thyristors Thyristors Thyristors are a class of semiconductor devices characterized by 4-layers of alternating p- and n-material. Four-layer devices act as either open or closed switches; for this reason, they are most frequently used in control applications such as lamp dimmers, motor speed controls, ignition systems, charging circuits, etc. Thyristors include Shockley diode, silicon-controlled rectifier (SCR), diac and triac. They stay on once they are triggered, and will go off only if current is too low or when triggered off. Some thyristors and their symbols are in figure 1. (a) 4-layer diode (b) SCR (c) Diac (d) Triac (e) SCS Figure 1 Shockley Diode The 4-layer diode (or Shockley diode) is a type of thyristor that acts something like an ordinary diode but conducts in the forward direction only after a certain anode to cathode voltage called the forward-breakover voltage is reached. The basic construction of a 4-layer diode and its schematic symbol are shown in Figure 2. Figure 2: The 4-layer diode. The 4-layer diode has two leads, labeled the anode (A) and the cathode (K). The symbol reminds you that it acts like a diode. It does not conduct when it is reverse-biased. The concept of 4-layer devices is usually shown as an equivalent circuit of a pnp and an npn transistor. Ideally, these devices would not conduct, but when forward biased, if there is sufficient leakage current in the upper pnp device, it can act as base current to the lower npn device causing it to conduct and bringing both transistors into saturation 68 Assist. -
The Transistor
Chapter 1 The Transistor The searchfor solid-stateamplification led to the inventionof the transistor. It was immediatelyrecognized that majorefforts would be neededto understand transistorphenomena and to bring a developedsemiconductor technology to the marketplace.There followed a periodof intenseresearch and development, duringwhich manyproblems of devicedesign and fabrication, impurity control, reliability,cost, and manufacturabilitywere solved.An electronicsrevolution resulted,ushering in the eraof transistorradios and economicdigital computers, alongwith telecommunicationssystems that hadgreatly improved performance and that were lower in cost. The revolutioncaused by the transistoralso laid the foundationfor the next stage of electronicstechnology-that of silicon integratedcircuits, which promised to makeavailable to a massmarket infinitely more complexmemory and logicfunctions that could be organizedwith the aid of softwareinto powerfulcommunications systems. I. INVENTION OF THE TRANSISTOR 1.1 Research Leading to the Invention As World War II was drawing to an end, the research management of Bell Laboratories, led by then Vice President M. J. Kelly (later president of Bell Laboratories), was formulating plans for organizing its postwar basic research activities. Solid-state physics, physical electronics, and mi crowave high-frequency physics were especially to be emphasized. Within the solid-state domain, the decision was made to commit major research talent to semiconductors. The purpose of this research activity, according -
HOW DID SILICON VALLEY BECOME SILICON VALLEY? Three Surprising Lessons for Other Cities and Regions
HOW DID SILICON VALLEY BECOME SILICON VALLEY? Three Surprising Lessons for Other Cities and Regions a report from: supported by: 2 / How Silicon Valley Became "Silicon Valley" This report was created by Rhett Morris and Mariana Penido. They wish to thank Jona Afezolli, Fernando Fabre, Mike Goodwin, Matt Lerner, and Han Sun who provided critical assistance and input. For additional information on this research, please contact Rhett Morris at [email protected]. How Silicon Valley Became "Silicon Valley" / 3 INTRODUCTION THE JOURNALIST Don Hoefler coined the York in the chip industry.4 No one expected the term “Silicon Valley” in a 1971 article about region to become a hub for these technology computer chip companies in the San Francisco companies. Bay Area.1 At that time, the region was home to Silicon Valley’s rapid development offers many prominent chip businesses, such as Intel good news to other cities and regions. This and AMD. All of these companies used silicon report will share the story of its creation and to manufacture their chips and were located in analyze the steps that enabled it to grow. While a farming valley south of the city. Hoefler com- it is impossible to replicate the exact events that bined these two facts to create a new name for established this region 50 years ago, the devel- the area that highlighted the success of these opment of Silicon Valley can provide insights chip businesses. to leaders in communities across the world. Its Silicon Valley is now the most famous story illustrates three important lessons for cul- technology hub in the world, but it was a very tivating high-growth companies and industries: different place before these businesses devel- oped. -
Publications Core Magazine, 2007 Read
CA PUBLICATIONo OF THE COMPUTERre HISTORY MUSEUM ⁄⁄ SPRINg–SUMMER 2007 REMARKABLE PEOPLE R E scuE d TREAsuREs A collection saved by SAP Focus on E x TRAORdinARy i MAGEs Computers through the Robert Noyce lens of Mark Richards PUBLISHER & Ed I t o R - I n - c hie f THE BEST WAY Karen M. Tucker E X E c U t I V E E d I t o R TO SEE THE FUTURE Leonard J. Shustek M A n A GI n G E d I t o R OF COMPUTING IS Robert S. Stetson A S S o c IA t E E d I t o R TO BROWSE ITS PAST. Kirsten Tashev t E c H n I c A L E d I t o R Dag Spicer E d I t o R Laurie Putnam c o n t RIBU t o RS Leslie Berlin Chris garcia Paula Jabloner Luanne Johnson Len Shustek Dag Spicer Kirsten Tashev d E S IG n Kerry Conboy P R o d U c t I o n ma n ager Robert S. Stetson W E BSI t E M A n AGER Bob Sanguedolce W E BSI t E d ESIG n The computer. In all of human history, rarely has one invention done Dana Chrisler so much to change the world in such a short time. Ton Luong The Computer History Museum is home to the world’s largest collection computerhistory.org/core of computing artifacts and offers a variety of exhibits, programs, and © 2007 Computer History Museum. -
BOOK PROPOSAL a NATION of INNOVATORS: by Gregory
BOOK PROPOSAL A NATION OF INNOVATORS: The Social, Cultural, and Economic Pioneers who Forged the American Century By Gregory Mitrovich Saltzman Institute of War and Peace Studies Columbia University Mitrovich Proposal Synopsis Is American preeminence doomed? Hundreds of books and thousands of articles have argued that the United States’ position as global leader is under threat by rising authoritarian nations—notably China—and the legacy of the Donald Trump presidency. TURNING POINTS challenges this consensus, demonstrating that throughout history, American liberal democracy has prevailed even under threat because of the unique strengths that first made the nation great: Its egalitarian society and innovative, risk-taking, national culture. TURNING POINTS makes this case by examining six crises that could have derailed America’s rise, yet did not—because its citizens enjoyed the liberty to find solutions where the federal government had failed. TURNING POINTS will begin with America’s first crisis point: Its brutal early years that the Colonists survived by creating a society that valued risk-taking, individual initiative and innovation, laying the foundation for the American liberal democracy. It will discuss the build-up to the Civil War when abolitionists led a crusade to convince America’s political leaders to end slavery—demonstrating to the world America’s sincere belief in the democratic system. During Reconstruction, while the federal government was paralyzed by incompetence and scandal, a group of ruthless business tycoons turned America into a global power. In the late 19th century, progressives reformed American labor and inspired the spread of democracy around the world. When the United States government withdrew into isolationism following World War I, private American bankers rebuilt the European financial system while American jazz musicians spread American culture, laying the foundation for American globalism after the Second World War. -
READING AIDS for the BLIND Harvey L
READING AIDS FOR THE BLIND Harvey L. Lauer Electronic Reading Machine Specialist Central Blind Rehabilitation Center Veterans Administration Hospital, Hines, Illinois 60141 SCOPE OF THE ARTICLE This article concerns inkprint reading aids for people who cannot use optical aids or closed-circuit TV systems. Available reading devices and some current research are described and discussed . The paper concerns work with adults, though there are many implications for children. HISTORY Before escorting you into the microcosmic world of reading aids, let me supply some background . In 1913, a British physicist, Dr. E.E. Fournier d'Albe described a reading aid for blind people and later built a crude model . A young woman, Mary Jameson, demonstrated it . Then a British engineering firm, Barr and Stroud, redesigned it and built six copies. Several blind persons have used them down to the present . Miss Jameson, the first user and teacher of the skill, is today active in the field. The British device is the first member of the optophone family. Optophone is the name for a class of machines which converts letter shapes into tone patterns . As the probe or camera is moved horizontally, each tone responds to an assigned portion of the letter along its vertical axis. For example, a letter V is heard as a descending scale of sound followed by an ascending scale . The letter I is heard largely as a chord because several of the photocells "see" the print simultaneously. Through the years, several designs of optophones have been built. The British machines first had five channels or tones; then they were given a sixth. -
SHOCKLEY, WILLIAM BRADFORD Els at Which Electrons Can (Or Cannot) Flow Through a Crys- (B
ndsbv6_S2 9/27/07 4:14 PM Page 437 Shockley Shockley Greenstein, Jesse, and Rudolph Minkowski. “The Crab Nebula John Bardeen and Walter Brattain, he invented the tran- as a Radio Source.” Astrophysical Journal 118 (1953): 1–15. sistor, sharing the 1956 Nobel Prize in Physics with them McCutcheon, Robert A. “Stalin’s Purge of Soviet Astronomers.” for this achievement. In particular, he conceived the junc- Sky & Telescope 78, no. 4 (October 1989): 352–357. tion transistor, a solid-state amplifier and switch that was Minkowski, Rudolph. “The Crab Nebula.” Astrophysical Journal commercialized during the 1950s and eventually led to 96 (1942): 199–213. Reprinted with commentary in A the microelectronics revolution. In founding the Shockley Source Book in Astronomy & Astrophysics, edited by Kenneth Semiconductor Laboratory in California, he catalyzed the R. Lang and Owen Gingerich. Cambridge, MA: Harvard University Press, 1979. emergence of Silicon Valley as the epicenter of the global semiconductor industry. As a Stanford University profes- Moroz, Vasilii I. “A Short Story about the Doctor.” Astrophysics & Space Science B252 (1997): 1–2, 5–14. sor during the last two decades of his life, he espoused Oort, Jan H. “The Crab Nebula.” Scientific American 196, no. 3 controversial views on race and intelligence that brought (March 1957): 52–60. On Shklovskii’s hypothesis of him substantial public attention and notoriety. synchrotron radiation as the source of its emission. Salomonovich, A. E. “The First Steps of Soviet Radio Early Years. Shockley was born in London on 13 Febru- Astronomy.” In The Early Years of Radio Astronomy: Reflections ary 1910, the only son of William Hillman Shockley, a Fifty Years after Jansky’s Discovery, edited by W. -
Oral History of Hans Queisser
Oral History of Hans Queisser Interviewed by: Craig Addison Recorded: February 27, 2006 Mountain View, California CHM Reference number: X3453.2006 © 2006 Computer History Museum Oral History of Hans Queisser Craig Addison: I am Craig Addison from SEMI. I am with Hans Queisser. We’re at the Computer History Museum in Mountain View, California, and today’s date is February 27, 2006. Hans, could we start off at the beginning and have you talk about where you were brought up and your educational background. Hans Queisser: Yes. I was born in Berlin, Germany, in 1931. My father was an engineer with the Siemen’s Company. And at that time, Siemen’s Town in Berlin was really a center of high technology. So I got very much influenced by my father, by our neighbors, in technical things. And I survived the Dresden air raid just barely in 1945 when I was 14 years old. And the end of the war was not easy, you can imagine. My father had to work for a Russian government agency. Times were tough. And my belief that I should enter a scientific field was strengthened by the fact that I could see that people who had a technical background and who had something to say, were treated very nicely by both the Russians and the Americans. But people who had nothing of value were treated rather badly. So that was my belief that in order to survive you had to have something that was a skill. And I wanted to go into physics, which I did. -
R and D of the Div. of Engineering National Research Evaluation Of
DOCUMENT RESUME ED 081 136 EC 052 421 TITLE Evaluation of Sensory Aids for the Visually Handicapped. INSTITUTION National Academy of Sciences - National Research Council, Washington, D.C. SPONS AGENCY Social and Rehabilitation Service (DHEW), Washington, D.C.; Veterans Administration, Washington, D.C. PUB DATE 72 NOTE 194p.; Report on a conference sponsored by the Subcommittee on Sensory Aids Committee on Prosthetics R and D of the Div. of Engineering National Research Council (National Academy of Sciences, Washington, D. C., Nov. 11-12, 1971) EDRS PRICE MF-$0.65 HC-$6.58 DESCRIPTORS Braille; Conference Reports; *Electromechanical Aids; *Exceptional Child Education; *Mobility Aids; *Sensory Aids; *Visually Handicapped ABSTRACT Presented are 11 papers given at a conference on the evaluation of sensory aids for the visually handicapped which emphasid mobility and reading aids beginning to be tested and distributed widely. Many of the presentations are by the principal developers or advocates of the aids. Introductory readings compare the role of evaluaticn in the prosthetics and orthotics program to the area of sensory aids and review the history of braille. Reading machines are considered in five papers with the following titles: "Evaluation of Certain Reading Aids for the Blind", "Experience in Evaluation of the Visotoner", "Optacon Evaluation Considerations", "Plans for the Evaluation of a High Performance Reading Machine for the Blind", and "A Digital Spelled-Speech Reading Machine for the Blind". The evaluation of mobility aids is examined in five papers with the following titles: "The VA--Bionic Laser Cane for the Blind", "Experience in Evaluation of the Russell Pathsounder", "Evaluation of the Ultrasonic Binaural Sensory Aid for the Blind", "Dearing Light Sensing Typhlocane--Model LST-3, and "Evaluation of Mobility Aids". -
Who Invented the Integrated Circuit?
Who Invented the Integrated Circuit? Gene Freeman IEEE Pikes Peak Region Life Member May 2020 Gene Freeman May 2020 Kilby and Noyce Photos (Kilby, TI Noyce, Intel) Gene Freeman May 2020 Commemorative Microchip Stamp Image: Computer- Stamps.com Gene Freeman May 2020 Motivation Gene Freeman May 2020 Trav-ler 4 Tube Tabletop AM Radio around 1949 Gene Freeman May 2020 Discrete passives and point to point wiring Gene Freeman May 2020 •Computers •Space vehicles Motivators •Decrease power, space, cost •Increase reliability Gene Freeman May 2020 • In an article celebrating the tenth anniversary of the invention of the computer, J. A. Morton, A Vice President of Bell Labs wrote in Proceedings of the IRE in 1958: • “For some time now, electronic man has known how 'in principle' to extend greatly his visual, tactile, and mental abilities through the digital transmission and Tyranny of processing of all kinds of information. However, all these functions suffer from what has been called Numbers 'the tyranny of numbers.' Such systems, because of their complex digital nature, require hundreds, thousands, and sometimes tens of thousands of electron devices. Each element must be made, tested, packed, shipped, unpacked, retested, and interconnected one-at-a-time to produce a whole system.” Gene Freeman May 2020 •Active Components: Vacuum Tubes to transistors Solution •Passive Components: Discrete elements to integrated form •Wires to integrated wires Gene Freeman May 2020 Key Companies in the Story 1925 1956 1968 Bell Labs – Western Electric and AT&T Shockley Semiconductor Laboratory – Intel- Formed 1968 consolidate research activities of Bell Started by William Shockley in 1956 By Robert Noyce and Gordon Moore System.