History of transistor, Electrical Engineering

History of Transistor:

The great Physicist Julius Edgar Lilienfeld filed the first patent for a transistor in Canada in the year 1925, explaining a device identical to a Field Effect Transistor or "FET" though, Lilienfeld did not publish any research articles about his devices, nor did his patent cite any instances of devices actually constructed. In the year 1934, German inventor Oskar Heil patented a similar device

From the year 1942 Herbert Mataré experimented with so-called Duodiodes when working on a detector for a Doppler RADAR system. The duodiodes made by him had two separate but very close metal contacts on the semiconductor substrate. He revealed effects that could not be described by two independently operating diodes and so formed the fundamental idea for the later point contact transistor.

In the year 1947, John Bardeen and Walter Brattain at AT&T's Bell Labs in the United States (US) observed that while electrical contacts were applied to a crystal of germanium, the output power was larger than as compared to the input. Solid State Physics Group leader William Shockley observed the potential in this and over the next some months worked to very much expand the knowledge of semiconductors. The term transistor was coined by John R. Pierce as per to physicist/historian Robert Arns, legal papers from the Bell Labs patent display that William Shockley and Gerald Pearson had built operational versions from Lilienfeld's patents, yet they never ever referenced this work in any of their later research papers or historical articles. The name transistor is a portmanteau of the word "transfer resistor"

The first silicon transistor was generated by Texas Instruments in the year 1954.This was the effort of Gordon Teal, an expert in growing crystals of high purity, who had earlier worked at Bell Labs.The first MOS transistor actually built was by Kahng and Atalla at Bell Labs in the year 1960.

Posted Date: 1/10/2013 6:17:51 AM | Location : United States







Related Discussions:- History of transistor, Assignment Help, Ask Question on History of transistor, Get Answer, Expert's Help, History of transistor Discussions

Write discussion on History of transistor
Your posts are moderated
Related Questions
Explain Fundamentals of Load Flow Analysis The calculation of electrical power system load flow or current flow is a problem which has no direct solution. It is not that a solu

Q. For the circuit shown in Figure, develop and execute a PSpice program to obtain the node voltages and the current through each element.

Background of Energy Conservation As a thumb rule, the energy needs of a country are about 1.5 times its GDP or the economic growth rate. India's projected growth rate up to

Equivalent Circuit of a Polyphase Induction Machine The inductionmachinemay be regarded as a generalized transformer inwhich energy is converted and electric power is transferr

Q. Explain Pulse-Code Modulation? PCM is the simplest and oldest waveform coding scheme for processing an analog signal by sampling, quantizing, and binary encoding. Figure sho

Q. Derive the equations of the self bias circuit? A circuit which is used to establish a stable operating point is the self biasing configuration. The circuit is shown in Fig

Q. Show Binary to Octal Conversion? It is simple to convert from an integer binary number to octal. This is accomplished by: Break the binary number into 3-bit secti

Q. Use (a) mesh analysis and (b) nodal analysis to determine the voltage ¯V at the terminals A-B of Figure.

Write an assembly language program to determine average of 'n' integers. Ans  MOV AX, 0000; Initial sum 0000  MOV BX, 0000  MOV SI, 0201H  MOV CX, [SI]  BACK: I

Q. A coaxial cable with polyethylene dielectric (ε r =2.26) connects an antenna to a receiver 30maway. Determine the velocity of wave propagation in the cable and the delay of the