This paper presents a synthetic overview of multilevel (ML) Flash memory program methods. The problem of increasing program time with the number of bits stored in each cell is discussed and methods based on both channel hot electrons (CHE) and Fowler-Nordheim tunneling (FNT) will be discussed. In the case of CHE, the use of an increasing voltage rather than a constant one on the control gate (CG) leads to narrower threshold voltage distributions and smaller current absortion, with positive effects on degree of parallelism and program throughput. As for FNT much faster programming than those commonly used today can be done using high CG voltages without producing intolerable degradation of cell reliability.
Grossi M., Lanzoni M., Riccò B. (2003). Program schemes for multilevel flash memories. PROCEEDINGS OF THE IEEE, 91(4), 594-601 [10.1109/JPROC.2003.811714].
Program schemes for multilevel flash memories
Grossi M.
Primo
;Lanzoni M.;
2003
Abstract
This paper presents a synthetic overview of multilevel (ML) Flash memory program methods. The problem of increasing program time with the number of bits stored in each cell is discussed and methods based on both channel hot electrons (CHE) and Fowler-Nordheim tunneling (FNT) will be discussed. In the case of CHE, the use of an increasing voltage rather than a constant one on the control gate (CG) leads to narrower threshold voltage distributions and smaller current absortion, with positive effects on degree of parallelism and program throughput. As for FNT much faster programming than those commonly used today can be done using high CG voltages without producing intolerable degradation of cell reliability.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
