Non-volatile memory and method with reduced source line bias errors
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United States of America Patent
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Mar 27, 2007
Grant Date -
Mar 25, 2004
app pub date -
Sep 24, 2002
filing date -
Sep 24, 2002
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Abstract
Source line bias is an error introduced by a non-zero resistance in the ground loop of the read/write circuits. During sensing the control gate voltage of a memory cell is erroneously biased by a voltage drop across the resistance. This error is minimized when the current flowing though the ground loop is reduced. A method for reducing source line bias is accomplished by read/write circuits with features and techniques for multi-pass sensing. When a page of memory cells are being sensed in parallel, each pass helps to identify and shut down the memory cells with conduction current higher than a given demarcation current value. In this way, sensing in subsequent passes will be less affected by source line bias since the total amount of current flow is significantly reduced by eliminating contributions from the higher current cells.
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- 15 United States
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Patent Owner(s)
- SANDISK TECHNOLOGIES LLC
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Cernea, Raul-Adrian | Santa Clara, CA | 131 | 7379 |
Li, Yan | Milpitas, CA | 1328 | 19621 |
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