History - field-effect transistor, Electrical Engineering

Assignment Help:

History - Field-Effect Transistor:

The principle of field-effect transistors was very first patented by Julius Edgar Lilienfeld in the year 1925 and by Oskar Heil in the year 1934, but practical semi-conducting devices (the JFET, junction gate field-effect transistor) was just only developed much later after the transistor effect was seen and described by the team of William Shockley at Bell Labs in the year 1947. The MOSFET (metal-oxide-semiconductor field-effect transistor) that largely superseded the JFET and had a more profound effect on electronic development was very first planned by Dawon Kahng in 1960.

Terminals

887_History - Field-Effect Transistor.png

Figure: Cross section of an n-type MOSFET

All FETs comprises a gate, drain, and source terminal which correspond roughly to the base, collector, and emitter of BJTs. Apart from the JFET, all FETs as well have a fourth terminal called the body, base, bulk, or substrate. This fourth terminal works to bias the transistor into operation; it is seldom to make non-trivial make use of the body terminal in circuit designs, but its existence is significant when setting up the physical layout of an integrated circuit. The size of the gate, length L in the figure, is the distance in between the source and drain. The width is the extension of the transistor, in the figure perpendicular to the cross section. Commonly the width is much larger than as compared to length of the gate. A gate length of 1µm limits the upper frequency to approximately 5 GHz, 0.2µm to approximately 30 GHz.


Related Discussions:- History - field-effect transistor

Synchronization, Synchronization:  Whatever type of weep is used, it must ...

Synchronization:  Whatever type of weep is used, it must be synchronized with the signal being measured. Synchronization has to be done to obtain a stationary pattern. This requir

Direct tapping and unmetered connections, Direct Tapping and Unmetered Conn...

Direct Tapping and Unmetered Connections Direct Tapping Direct tapping of power by non-customers is widely prevalent. This is mainly in domestic and agricultural categori

Find the turns ratio of the ideal transformer, Q. Consider an ampli?er as a...

Q. Consider an ampli?er as a voltage source with an internal resistance of 72 . Find the turns ratio of the ideal transformer such that maximum power is delivered when the ampli?e

Draw the implementation of time invariant system, Draw the implementation o...

Draw the implementation of time-invariant system A linear time-invariant system is described by the difference equation: y[n] = 2x[n] - 3x[n - 1] + 2x[n - 2]   Draw the i

Determine the peak fundamental component of the mmf, Q. A two-pole, three-p...

Q. A two-pole, three-phase synchronous generator has a balanced three-phase winding with 15 turns per phase. If the three-phase currents are given by i a = 100 cos 377t, i b =

Explain a tube well, Q. Explain a Tube Well? Method of restoring or inc...

Q. Explain a Tube Well? Method of restoring or increasing the capacity of tube well is known as developing a Tube Wells. This is done to eliminate bridging of fine particles on

Energy meter, Energy Meter 1. The energy meter is the cash register of...

Energy Meter 1. The energy meter is the cash register of the utility. Energy meters form a vital instrument of revenue realization for the Supply Utilities. Based on the meter

Svd, svd calculation in matrix

svd calculation in matrix

What is the speciality of a darlington transistor, Q. What is the specialit...

Q. What is the speciality of a darlington transistor? A darlington pair behaves like a single transistor with a very high current gain. The total gain of the darlington is the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd