19 - MOSFET threshold

# 19 - MOSFET threshold - EECS 320 MOSFET Threshold MOSFET...

This preview shows pages 1–4. Sign up to view the full content.

EECS 320 MOSFET Threshold J. Phillips EECS 320 MOSFET Structure The Idea: Control current flow from source to drain using applied gate voltage Our MOS analysis showed that charge at Si/SiO 2 interface is strongly dependent on V G The resistance from source to drain will vary with this charge in the “channel”

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
J. Phillips EECS 320 Band Diagram Cross section in channel Create inversion layer in channel for current conduction J. Phillips EECS 320 More Band Diagrams Band diagram in inversion What does PMOS look like? Band diagram along channel
J. Phillips EECS 320 Review of Bias Effects - - - - - - - - - + h + h + h + h + h + h + h + - - h + h + - - h + h + e - e - e - e - e - e - e - e - e - e - J. Phillips EECS 320 MOSFET Threshold Voltage Define condition where channel charge is significant ρ M O S q φ F q φ s Define where inversion charge at SiO 2 /Si equal to depletion charge Mathematically, φ S =2 φ F = i A F n N q kT ln φ ox F A S F MS T C N q V φ ε φ φ 4 2 + + = ox F D S F MS T C N q V φ ε φ φ 4 2 =

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern