Method and Apparatus for Systematic and Random Variation and Mismatch Compensation for Multilevel Flash Memory Operation
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United States of America Patent
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app pub date -
Oct 1, 2010
filing date -
Sep 26, 2005
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Abstract
Method and means for random or systematic mismatch compensation for a memory sensing system are disclosed. A sense amplifier includes a bulk voltage source to set the bulk of the sensing transistor to be a voltage different than the voltage driving the sensing transistor. For an NMOS sensing transistor, a triple well is used with the variable bulk voltage. Differential sense amplifiers with various offset compensation are included. Intentional offset creation for useful purpose is also included.
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