Link to a website explaining the details of MOS-FET Transistors

Other Hardware General Electronics
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Hi everybody,

I'm tinkering with electronics for a real long time with a medium level of knowledge about electronics. I do understand things like ohms law, voltage-drop, voltage-divider, NPN/PNP-transistors, diodes a longer time ago I worked through a tutorial about operational amplifiers
inverting / non-inverting amplifiers schmitt-trigger with hysteresis etc.

I can use transistors and MOS-FETs for switching purposes. Yesterday I came across this thread where somebody was asking about voltage-level-shifters

I can explain the basic function what happends if you connect different voltage-levels in the sense of what voltages do you get.

But I can not (yet) explain the details why and how does it work in detail.

Can somebody recommend a link where the details of how the different types of MOS-FETs

  • N-channel
  • P-channel
  • depletion-mode
  • enhancement-mode

are explained in the most easy to understand way.

Now what's the most easy to understand way???
Of course I know the basics of atoms, protons, neutrons, electrons, elctron-holes
I know what an electrostatic field is etc.

If you happen to know two or more links I would appreciate it very much if you look them both up and decide which one of the two is easier to understand and just post that one

But of course if you post at least one link that is appreciated too.

best regards Stefan

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I think, Wikipedia is good source of such information you are looking for, as a start at least.

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IMO the (few) basic circuits explain best how to use MOSFETs. That's how I prefer to understand electronic parts. Next come the characteristic values that have to be known for calculating the other components.

For BJT I know that Ube=0.7V and Ic=ß*Ib, very simple.
For MOSFET I know that Uth varies widely and Isd=(Ugs-Uth)*gfs or Rds-on @ Ugs>Ugs-on.

4

I do have an (or several) electronics book that cover MOSFET transistors, the main one I use is The Art Of Electronics Third Edition.
There book was current in 2018 when I bought it.

That is the best one that I have I can recommend.

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I would not recommend ANY website for learning anything unless I could verify that all the information was correct. However, who am I to say what's correct or not?

Take the Wikipedia article cited by @Budvar10 . The article's original author is an unknown/unregistered user only identified as 213.253.39.153. Did this person actually know anything about semiconductor physics?

I may be old-fashioned but I only trust information I see in print (or an E-book). A good book on semiconductor physics, especially one that has been used as course material at an accredited university would be an excellent source of learning.

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Google the The Art Of Electronics Third Edition it is an actual hard cover book sitting on my shelf.

Nope, perfectly reasonable for me I have 2 main electronics books in hard cover that I use more then the Internet.

I mostly look datasheets up on the internet.

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However they appear to have a improved the 3rd edition(Warned you mine was old). :wink:

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What wrong information did you find?

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Is something wrong with Wikipedia? The articles are written, maintained and corrected by many people around the world. My personal experience with Wikipedia is definitely positive in general.
Anyway, there are references at the end of articles. You can read directly any of them, if you hesitate to trust Wikipedia.

1 Like
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One of my favorite pictures in the whole book is a picture of a MOSFET gate that has encountered electrostatic.

The picture in the book is from a electron microscope zoomed in so you can see the destruction. :crazy_face:

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Thank you very much for your answers

user @ Zardof guided me to the right page in this application note that explains the function

https://cdn-shop.adafruit.com/datasheets/an97055.pdf

Bottom of page 10 and top of page 11 explains how this circuit works. Inputs are needed to see how this circuit actions.

Then I looked up youtube if I may find a animated video that explains what happends inside a MOS-FET and found a youtube-channel with a very good explanation. The channel is called LESICS

image
image982×256 60.9 KB

excellent explanation

best regards Stefan

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