Patent ID: 7660164
Filing Date: 2010-02-09
Classification: G11C

Abstract:
1. A method for estimating a threshold voltage of a semiconductor nonvolatile memory device, the method including: measuring threshold voltages of sample semiconductor nonvolatile memory devices over a range of pulse widths, the sample semiconductor nonvolatile memory device comprising first source/drain regions in a first semiconductor substrate and a first charge storage layer sequentially comprising a first oxide layer, a nitride layer and a second oxide layer on the first semiconductor substrate; computing a threshold voltage of a manufactured semiconductor nonvolatile memory device according to inputted pulse width values through an equation:  the manufactured semiconductor nonvolatile memory device comprising second source/drain regions in a second semiconductor substrate and a second charge storage layer sequentially comprising a first oxide layer, a nitride layer and a second oxide layer on the second semiconductor substrate; and estimating a state of the nitride layer in the second charge storage layer using the computed threshold voltage; wherein V