Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Polarization MOSFET SOI

Status
Not open for further replies.

lufer17

Member level 5
Joined
Jul 15, 2019
Messages
84
Helped
0
Reputation
0
Reaction score
0
Trophy points
6
Activity points
882
Hello everyone, I have a question about the N channel MOSFET SOI N, how is the device bulk polarized?


MOSFET.png
 

P- to intrinsic, depending on the desired VT. Either a
desirable starting material doping, or VT adjust implants.
 

Questions:

1. What do you mean under "polarized" - applied voltage, or doping type? (I think, you mean the former).
2. What do you mean under "bulk" - body of SOI MOSFET, or substrate region under BOX?
3. is this FDSOI or PDSOI? (i.e., fully depleted or partially depleted?).
 

Questions:

1. What do you mean under "polarized" - applied voltage, or doping type? (I think, you mean the former).
2. What do you mean under "bulk" - body of SOI MOSFET, or substrate region under BOX?
3. is this FDSOI or PDSOI? (i.e., fully depleted or partially depleted?).

1- yes applied voltage
2-region of the substrate where is the VG2.
3-FDSOI

Objective: use as amplifier
 

Applied voltage varies with technology and application environment.
Ground (or negative rail) is common, but SOI technologies meant for
space and other radiation environments may apply a more negative
potential (which might then risk turning on the PMOS back channel,
there's a "BOX bias box").
 

In FDSOI technologies, adaptive back bias (voltage applied to substrate or well under BOX) is a popular and common technique to control leakage vs performance tradeoff.
Positive voltage will lower Vt for nMOSFET, and increase its ON current.
When device / block goes to off state, bias can be zero or negative.

See, for example, here:

http://semiengineering.com/the-return-of-body-biasing/

or here:

**broken link removed**
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top