The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 18, 2001
Filed:
Mar. 20, 2000
Jung-Yu Tsai, Taipei Hsien, TW;
Chih-Mu Huang, Hsinchu, TW;
Chi-Hung Kao, Taipei, TW;
Chuan-Jane Chao, Hsinchu, TW;
Winbond Electronics Corp., Hsinchu, TW;
Abstract
A method is used to fully extract coupling coefficients of a flash memory cell by a GIDL manner. The flash memory cell is composed of a substrate, a drain region, source region, a control gate and a floating gate. The method keeps the source voltage Vs and the substrate voltage Vb fixed. The drain voltage Vd and the control gate voltage are varied. Then, measuring a GIDL current obtains a first coefficient ratio of the drain coupling coefficient ad to the gate coupling &agr;cg, that is, &agr;d/&agr;cg. Similarly, keeping the drain voltage Vd and the substrate voltage Vb fixed and varying the source voltage Vs and the control gate voltage Vcg, a second coefficient ratio of the source coupling coefficient &agr;s to the gate coupling coefficient &agr;cg, that is, &agr;s/&agr;cg. Similarly, keeping the drain voltage Vd and the source voltage Vs fixed and varying the control gate voltage Vcg and the substrate voltage Vb, a third coefficient ratio of the substrate coupling coefficient &agr;b to the gate coupling coefficient &agr;cg, that is, &agr;b/&agr;cg. The first coefficient ratio &agr;d/&agr;cg, the second coefficient ratio &agr;s/&agr;cg, and the third coefficient ratio &agr;b/&agr;cg incorporate a normalization equation of &agr;d+&agr;s+&agr;b+&agr;cg=1, so that all four coefficients &agr;d, &agr;s, &agr;b, and &agr;cg can be exactly solved.