The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Jun 19th, 2019, 10:01pm
Pages: 1
Send Topic Print
For MOS Cap, is the a depletion region in MOS when VFB < VGB < 0? (Read 2231 times)
mpig09
New Member
*
Offline



Posts: 2

For MOS Cap, is the a depletion region in MOS when VFB < VGB < 0?
May 25th, 2017, 5:47pm
 
Hi all:

Many books explain the MOS Cap value is Cox(oxide cap) serial Cdep(depletion cap) when VFB < VGB < VTH,
I have a questions: is there a depletion region in MOS when VFB < VGB < 0?

VFB : Flat band voltage

If Yes, could you help me to understand it.

Thank.

mpig
Back to top
 

MOS_Cap.png
View Profile   IP Logged
Maks
Community Member
***
Offline



Posts: 41
San Jose
Re: For MOS Cap, is the a depletion region in MOS when VFB < VGB < 0?
Reply #1 - May 27th, 2017, 1:58pm
 
There is always depletion region when Vg > VFB.
At Vg> Vt though, the depletion regions is "screened" (or shielded) by the inversion layer (a thin layer of electrons in the channel, at the Si/oxide interface, supplied from N+ source/drain regions).

If you want to understand what all these terms mean - depletion, deep depletion, accumulation, inversion - you can read any textbook on semiconductor device physics (for example, S.Sze book "Physics of semiconductor devices").

Max
Back to top
 
 
View Profile   IP Logged
mpig09
New Member
*
Offline



Posts: 2

Re: For MOS Cap, is the a depletion region in MOS when VFB < VGB < 0?
Reply #2 - Jun 5th, 2017, 2:49am
 
Hi Max:

I have solved the problem.
Smiley

mpig
Back to top
 
 
View Profile   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2019 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.