Patent ID: 6812083
Filing Date: 2004-11-02
Classification: G11C,H01L

Abstract:
A fabrication method for a metal oxide semiconductor transistor of a non-volatile memory, the method comprising:forming a first doped region, a second doped region and a third doped region on a well; forming a control gate between the first doped region and the second doped region; forming a floating gate between the second doped region and the third doped region; providing a first biasing voltage between the first doped region and the control gate such that the first doped region and the second doped region are conductive; providing a second biasing voltage between the second doped region and the well, so as to generate a channel current between the second doped region and the third doped region, and generate a gate current; wherein if a voltage difference between the third doped region and the floating gate is smaller than a value of a threshold voltage of the metal-oxide-semiconductor transistor, increasing a capacitance between the floating gate and the third doped region to larger than a total capacitance synthesized between the floating gate and the well, the floating gate and the second doped region, and the floating gate and the control gate; or increasing a capacitance between the floating gate and the control gate to larger than a total capacitance synthesized between the floating gate and the third doped region, the floating gate and the well, and the floating gate and the second doped region; wherein if a voltage difference between the third doped region and the floating gate is larger than the threshold voltage, decreasing the capacitance between the floating gate and the third doped region to smaller than the total capacitance synthesized between the floating gate and the well, the floating gate and the second doped region, and the floating gate and the control gate; and decreasing the capacitance between the floating gate and the control gate to smaller than the total capacitance synthesized between the floating gate and the third doped region, the floating gate and the well, and the floating gate and the second doped region.