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Derivation of MOSFET Threshold Voltage from the MOS ... - …

Derivation of MOSFET Threshold Voltage from the MOS Capacitor ENEE 313 Notes Prof. Neil Goldsman Threshold Voltage is the Voltage applied between gate and source of a MOSFET that is needed to turn the device on for linear and saturation regions of operation. The following analysis is for determining the Threshold Voltage of an N-channel MOSFET (also called an N- MOSFET ). The analysis is performed with a MOS capacitor like the one shown below. Structure MOS Capacitor: Top layer is N-type polysilicon or metal. For this Derivation we will assume it is heavily doped N-type polysilicon with doping ND S1O2 (oxide) insulation sandwiched between two conductors The bottom layer is P-type semiconductor of doping NA We will relate the built-in potential of the device to the Voltage drop across the three layers.

Derivation of MOSFET Threshold Voltage from the MOS Capacitor ENEE 313 Notes Prof. Neil Goldsman Threshold voltage is the voltage applied between gate and source of a MOSFET that is needed to turn the device on for linear and saturation regions of …

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