G - Physics – 11 – C
Patent
G - Physics
11
C
352/82.22
G11C 11/40 (2006.01) G11C 11/35 (2006.01) G11C 14/00 (2006.01) G11C 16/04 (2006.01) G11C 19/28 (2006.01) H01L 27/04 (2006.01) H01L 27/108 (2006.01)
Patent
CA 1130002
ABSTRACT CHARGE TRANSFER STORAGE SYSTEMS Storage systems are provided with memory cells made of devices having different voltage thresholds for storing information permanently or semipermanently. The devices are arranged adjacent to each other and communicating with a different region in a semi- conductor substrate. Information is sensed by detecting the charge transferred from a selected cell to the diffusion region. In an embodiment of the invention, a P-type substrate has an N+ diffusion region formed therein with a plurality of adjacent and parallelly arranged word lines insulated from the substrate and disposed adjacent to the N+ diffusion region. A P+ region, preferably implanted into the substrate, is disposed under selected segments of the word lines to provide devices having a first or high threshold voltage magnitude. The remaining devices which are not associated with a P+ region have a second or low threshold voltage magnitude. By applying a voltage of the same magnitude to each of the word lines, potential wells are formed which are filled by charge or carriers from the diffusion region. Since the potential wells associated with the high threshold devices hold less charge than do BU-9-78-009 the low threshold devices, a charge or voltage sensing circuit connected to the N+ diffusion region is used to detect the amount of charge flowing between the wells and the diffusion region to thus identify the high and low threshold devices when the voltage on the selected word line is decreased. By eliminating the P+ regions and storing charge, e. g., electrons, at selected locations under the word lines in dual insulating layers, the cells may BU be electrically programmable. BU-9-78-009 Abstract Continued
337647
International Business Machines Corporation
Na
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