History - field-effect transistor, Electrical Engineering

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 The MOSFET (metal-oxide-semiconductor field-effect transistor) that largely superseded the JFET and had a more profound effect on electronic development was very first planned by Dawon Kahng in 1960.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.

Posted Date: 1/11/2013 4:47:15 AM | Location : United States







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

Write discussion on History - field-effect transistor
Your posts are moderated
Related Questions
PLC ( Programmable Logical  Controller ) PLC  stand for programmable logical  controller.  PLC   is an  industrial computer  used to monitor inputs and depending upon  their  m

Unconditional Return RET Instruction: This  instruction is used to transfer the program sequence  from subroutine to the calling  program unconditionally. The instruction forma

The interrupt vector table is always created in the first 1K area of the memory. Justify the statement. While the CPU receives an interrupt type number start from the PIC, this

A 3-bit quantizer is utilized to transform the following signal into a binary digital signal. Determine the binary values of the first three samples (assuming the quantizer rounds

Q. A certain 10-hp, 230-V motor has a rotational loss of 600 W, a stator copper loss of 350 W, a rotor copper loss of 350 W, and a stray load loss of 50 W. It is not known whether

Fourier transform  (filtering) (i) Perform low pass filtering in the frequency domain. Write and m-file lowfft.m which does this operation. lowfft.m function lowfft im

Q. What do you mean by FM Stereo? IT  shows the block diagram of an FM stereo transmitter and an FM stereo receiver. The following notation is used: • f L (t), fR(t): Left a

Explain the Construction of Synchronous Machines? Basically all synchronous machines require a DC excited field winding in order to produce magnetic flux. For majority of machi

Explain DAA instruction. DAA: The DAA instruction follows the instruction ADC or ADD to adjust the result in a BCD result. The DAA instruction performs only with the AL registe

Explain Soft magnetic materials. Soft magnetic materials -They contain small enclosed area of hysteresis loop, high permeability low eddy current losses and high saturation