Talk:Field-effect transistor
Most of what I've done here doesn't need any explanation, but there's one correction I think warrants a note. I replaced every instance of "glass" with "oxide". This is because the silicon dioxide layer under a gate is not glass. Glass would not work. A glass is an amorphous solid - irregular arrangement of atoms. The common usage of "glass" happens to be an instance of this. SiO2 in MOSFETs is crystalline, not glass. -- Tim Starling
- Small correction: amorphous oxides can work perfectly well as gate oxides. see link. At least as far as I know, these films are almost entirely amorphous. The best films are done with ECR, but you can also use PECVD and get decent results. On physical grounds, I don't see any reason why a gate dielectric has to be crystalline in "work". --User:Dgrant
You're the man Dave, I'll take your word for it. Before you came along, I didn't know amorphous oxides were used for anything other than window glass :) I notice that the resistivity of the oxide in your reference is many orders of magnitude less than for crystalline silicon. That would degrade performance somewhat, but at least the breakdown voltage is still high. -- Tim Starling
what does "whereas those to the left abstract from the body contact." mean? It doesn't make any sense to me, or at least is doesn't convey the indended meaning, in my mind. dave
- It doesn't mean anything. I changed it to something which makes sense, and is probably right. I seem to remember seeing some FET-like structures with the body insulated from the backside, but I don't think they do that for MOSFETs. -- Tim Starling 00:39 May 14, 2003 (UTC)
mosfet symbols
The schematic for your MOSFET shows a solid line connecting the Source and Drain. Does this not indicate a depletion mode MOSFET?. An enhancement mode MOSFET is symbolically shown with a dashed line between the Source and Drain.
The arrows for the 'metallurgical' contacts point at the bottom of the N diffusions. The metal contact is on the top surface. Shouldn't your arrows point to the upper surface of the N regions?.
- All textbooks use different notations. I can't remember right now what is right, and what is depletion, enhancement, etc... However, should use standard IEEE conventional symbols, whatever those are, and we should state that they are the IEEE standard symbols. If there are some common "misuses" of the symbols out there, then we should mention that. So first thing I think is to check IEEE and see if there are standard symbols, and secondly to check something like Art of Electronics and see what it uses. dave 22:06, 16 Oct 2003 (UTC)
IEEE: http://ewh.ieee.org/soc/es/Nov1998/14/education/
MOSFET section
I'm planning on doing a lot of work on the MOSFET section. I hope to discuss how MOSFETs are evolving to smaller and smaller submicron dimensions, and the problems designers are encountering...obviously non-technically. I've created two subcategories I want to expand upon--why MOSFETs are so popular and the problems with scaling. Rmalloy 13:47, 14 Jul 2004 (UTC)
I think some work needs to be done in the introduction to MOSFET...most important part. for later. Rmalloy 18:38, 14 Jul 2004 (UTC)
- Thanks for your efforts! I assume at some point it would make sense to put all MOSFET stuff in separate article. Agreement? Pjacobi 19:26, 14 Jul 2004 (UTC)
- I dunno, I'm new here and don't know what the protocols are. As long as info is easily accessible it makes little difference to me. I'm not going to touch stuff like that. Rmalloy 20:06, 14 Jul 2004 (UTC)
External links
IMHO the external link [1] is somewhat obscure - and I'm a member of that Yahoogroup! It's neither focused on FETs nor well known. I plan to remove the link when I have some better to provide. Pjacobi 19:26, 14 Jul 2004 (UTC)
- Yeah, that's a dubious link. Interesting group though.
Analog circuits
I've added all I feel comfortable adding about MOSFETs in analog circuits. I wish someone could discuss analog stuff, since everything is so digital digital digital. Rmalloy 23:38, 14 Jul 2004 (UTC)