What is the difference between a normal transistor and a FET Transistor?
Modern Physics, Week 6
Rodrigo Almodóvar. 15/06/15
Background
In our 6th month during the Modern Physics course, as our review, we were asked to choose a topic of those:
LEDs
Transistors and semiconductors
Lasers
Optical devices and optical data transmission
Historical experiments
In my point of view Transistors and semiconductors is the most interesting topic, so I will write about it.
Initial questions:
In this topic, some questions arise:
...
What are the main transistor applications?
How are transistors and semiconductors related?
What is the difference between a normal transistor and a FET transistor?
Selected problem:
Of these questions previously mentioned, I found the most interesting the one about how are transistors and semiconductors related. Nonetheless, I was encouraged by our teacher Sakari to going deeper on the following question:
...
And that is what this report is going to talk about.
Own explaination (original hypothesis)
As we have already study during this course, a transistor is a result of connecting three different types of semiconductors. They can appear as p-n-p connections or n-p-n connection. If I remember it well, transistors could change current intensity.
...
A FET transistor is a Field-effect Transistor, and by its name I can suppose it may change some property of the electromagnetic field.
Critical evaluation
Weak points about my explanation:
I don’t know anything about FET transistors
My affirmation is based in my own knowledge and for that reason it could be wrong.
Strong points:
As we have studied this field before, I have some previous knowledge to use.
In order to improve my explanation:
Search for relevant information on the internet
Understand what makes the FET transistor so special
Search results
Here I will put some interesting links I found on the internet that I will use to expand my knowledge and further explain my conclusion.
...
Summary (New explanation)
First of all, I would like to show what is the appearance of a transistor, because most of the time we talk about transistors or other elements but we don’t know how do they really look like. So, this is the aspect of a PNP bipolar transistor, as well known as BJT (Bipolar Junction Transistor):
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In addition, most of FET parameters are higher than a bipolar transistor parameters:, as we can see from this picture:
References:
“Field-Effect Transistor.” Wikipedia. Wikimedia Foundation, n.d. Web. 15 May 2015. <http://en.wikipedia.org/wiki/field-effect_transistor>
“Transistor FET (Field Effect Transistor).” FET de juntura o JFET, transistor de efecto de campo (canal N, canal P). N.p., n.d. Web. 15 May 2015. <http://unicrom.com/tut_fet.asp>
“Transistor Tutorial About Bipolar and FET Transistors.” Basic Electronics Tutorials. N.p., Mar. 2013. Web. 15 May 2015. <http://www.electronics-tutorials.ws/transistor/tran_8.html>
“Transistors.” How do transistors work? N.p., n.d. Web. 15 May 2015. <http://www.explainthatstuff.com/howtransistorswork.html>
“Transistors.” Transistors. N.p., n.d. Web. 15 May 2015. <http://www.mikroe.com/old/books/keu/04.htm>
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