Modeling of a floating-gate EEPROM cell using a charge sheet approach

A model for static and transient simulations of an electrically erasable programmable read only memory cell has been developed. This physical compact model is based on charge sheet approach which is able to describe the complete electrical behavior of the cell. In this model the charge neutrality, including the charge trapped on the floating gate, is applied to determine the surface potential. From the surface potential, related to the terminal voltages, the drain current and the different charges present in the cell structure can be calculated. This model has been successfully implemented in common circuit simulators and used for the study of the write/erase operations in an electrically erasable programmable read only memory cell.