MOS Capacitor Picture.

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Presentation transcript:

MOS Capacitor Picture

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

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

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

MOS Structure Electrostatics

MOS Electrostatics

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

MOS Capacitor Picture