Adjustable threshold voltage conversion circuit

Static information storage and retrieval – Floating gate – Particular biasing

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36518502, 36518524, 36518529, G11C 1134

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active

055218679

ABSTRACT:
A flash EPROM circuit for providing a tight erase threshold voltage distribution. The circuit includes an array of memory cells having gates, sources and drains. Bit lines are coupled to the drains of a column of cells in the memory array. A plurality of word lines are each coupled to the gates of a row of cells in the memory array. A first voltage source is coupled to the bit lines to converge threshold voltages of erased memory cells. A second voltage source is coupled to the word lines to control the threshold voltages of the erased memory cells.

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patent: 5406521 (1995-04-01), Hara
Patent Abstracts of Japan, vol. 16, No. 8 (E-1152), Jan. 10, 1992 & JP-A-03 230566 (Mitsubishi Electric Corp.) Oct. 14, 1991, Abstract.
"A Self-Convergence Erasing Scheme for A Simple Stacked Gate Flash EEPROM," Yamada, et al., IEEE, 1991, pp. 91-307-91.310.
"Device Performance Degradation Due To Hot-Carrier Injection At Energies Below The Si-SiO.sub.2 Energy Barrier," Takeda, et al., IEEE, 1983, pp. 83-396-83--399.
Haddad et al., "An Investigation of Erase-Mode Dependent Hole Trapping in Flash EEPROM Memory cell", Nov. 1990, vol. 11, IEEE pp. 514-516.
Haddad et al., "Degradations due to Hole Trapping in Flash Memory cells", Mar. 1989, vol. 10, IEEE, pp. 117-119.

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