Non-volatile storage with adaptive body bias
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United States of America Patent
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Apr 28, 2009
Grant Date -
Jul 3, 2008
app pub date -
Dec 30, 2006
filing date -
Dec 30, 2006
priority date (Note) -
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Abstract
A non-volatile storage system in which body bias can be applied to optimize performance. Body bias can be set in an adaptive manner to reduce an error count of an error correcting and/or detecting code when reading data from non-volatile storage elements. Also, a body bias level can be increased as a number of programming cycles increases. Also, body bias levels can be set and applied separately for a chip, plane, block and/or page. A body bias can be applied to a first set of NAND strings for which operations are being performed by controlling a first voltage provided to a source side of the first set of NAND strings and a second voltage provided to a p-well. A source side of a second set of NAND strings for which operations are not being performed is floated or receives a fixed voltage.
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