Static information storage and retrieval – Floating gate – Particular biasing
Patent
1999-09-15
2000-08-15
Dinh, Son T.
Static information storage and retrieval
Floating gate
Particular biasing
3651852, 36518523, 36518905, G11C 1604
Patent
active
06104637&
ABSTRACT:
An apparatus for programming a threshold-voltage of a non-volatile memory cell includes a reference voltage generator means applying a predetermined voltage to a word line of a reference memory cell having the same electric characteristics as the memory cell desired to be programmed and generating a reference voltage by thusly generated current; a comparator means comparing the reference voltage with a bit line voltage according to the cell current flowing at the memory cell to be programmed; a word line voltage generator means being controlled by a level count value, selecting word line voltages corresponding to the plurality of threshold voltages of the memory cell to be programmed and outputting it; a word line driving means applying the word line voltages selected by the word line voltage generator means to the word line selected by the word line enable signal; a level data selector means encoding a state data and selectively outputting data corresponding to each level by the level select signal; a latch means being controlled by the output signal from the comparator, latching the data outputted from the level data selector means; a bit line voltage controller means selectively discontinuing programming according to the level of the data latched by the latch means; and a bit line selector means selecting a specific bit line by a bit line enable signal
REFERENCES:
patent: 5654918 (1997-08-01), Hammick
patent: 5818759 (1998-10-01), Kobayashi
patent: 5998831 (1999-12-01), Kodama et al.
patent: 6021068 (2000-02-01), Miki et al.
Dinh Son T.
Hyundai Micro Electronics Co., Ltd.
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