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Essay / Research Paper Abstract
A five page paper which looks at the structure and function of thyristors, and the current expansion in usage of ISM frequency bands, especially with regard to wireless LANs. Bibliography lists 4 sources
Page Count:
5 pages (~225 words per page)
File: JL5_JLthyr.rtf
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Unformatted sample text from the term paper:
is a three terminal device, consisting of an anode, cathode and gate, which can be represented in the circuit symbol by the anode and cathode opposite one another, and the
gate to the side. The anode is seen at the top of the symbol, and a line leads vertically down from it to a triangle pointing downwards: another vertical line
then leads from the point of the triangle to the cathode. There is a horizontal line which lies across the point of the triangle, and a line then leads from
this to the left, which is seen terminating at the gate.
The thyristor is also known as a silicon-controlled rectifier, or SCR, and can be described as a semi-conductor device rather like a diode,
but with an extra terminal which is used to turn it on. Semiconductors are components which make use of the properties of semiconductor materials, such as silicon, and conduct through
solid-state rather than vacuum. Conduction takes place through the impurities in the crystalline structure of the material. Once the thyristor is switched on, it continues to conduct whilst there is
current present: once the current is no longer there, the thyristor will switch off.
It consists of four layers, each layer being alternate N or P material. N (negative) semiconductors are those which have an excess of
free electrons, and P (positive) semiconductors contain holes. These holes in the lattice of the crystal react to any change in electronic field in the same way that positively-charged free
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