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MOS Capacitor Picture.

Published byDale Harvey Modified over 8 years ago

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Presentation on theme: "MOS Capacitor Picture."— Presentation transcript:

1 MOS Capacitor Picture

2 MOS Electrostatics Condition is called flatband --- the voltage when this occurs is called flatband This state is the baseline operating case --- a capacitive divider has one free parameter

3 MOS Electrostatics Depletion Condition --- gate charge is terminated by charged ions in the depletion region Part of this region is often referred to as weak-inversion

4 MOS Electrostatics Inversion --- further gate charge is terminated by carriers at the silicon--silicon-dioxide interface

5 MOS Structure Electrostatics

6 MOS Electrostatics

7 MOS-Capacitor Regions
Surface potential moving from depletion to inversion Qs = e (Y - Vs)/UT Qs = ln( 1 + e ) (k(Vg - VT) - Vs)/UT Depletion (k(Vg - VT) - Vs < 0) Qs = e (k(Vg - VT) - Vs)/UT Inversion (k(Vg - VT) - Vs > 0) Qs = (k(Vg - VT) - Vs)/UT

8 MOS Capacitor Picture

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