Patent ID: 7859290

Claim:
A method for measuring an effective channel comprising: connecting a substrate formed with a gate, a source, and a drain to testing terminal; and then measuring a first modified capacitance having no leakage component among the source, the drain, a bulk, and the gate with respect to an inversion region and an accumulation region of the substrate; and then measuring a second modified capacitance having no leakage component between the bulk and the gate with respect to the inversion region and the accumulation region of the substrate; and then measuring an overlap capacitance using the first modified capacitance and the second modified capacitance; and then measuring an effective channel width using the overlap capacitance, wherein said measuring a first modified capacitance comprises: connecting a high terminal to the source, the drain, and the bulk, and connecting a low terminal to the gate; and then measuring a leakage current I leak — bsd — inv of an inversion region and a leakage current I leak — bsd — acc of an accumulation region by applying an operation voltage V g to the gate using a leakage current measuring device; and then measuring a capacitance C bsd — inv of the inversion region and a capacitance C bsd — acc of the accumulation region by using a capacitance measuring unit; and then measuring the first modified capacitance having no leakage component among the source, the drain, the bulk, and the gate with respect to the inversion and accumulation regions by using the leakage current I leak — bsd — inv of the inversion region, the leakage current I leak — bsd — acc of the accumulation region the capacitance C bsd — inv of the inversion region, and the capacitance C bsd — acc of the accumulation region.