Operation scheme for spectrum shift in charge trapping non-volatile memory
US7209390B2 · kind B2 · utility
65Cited by
64References
39Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 24, 2004 |
| Grant date | Apr 24, 2007 |
| Priority date | — |
| Expiry date | Jan 2, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/3436
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A memory cell with a charge trapping structure is programmed using refill cycles that include a program pulse followed by a charge balancing pulse that causes ejection of electrons from the charge trapping structure. The refill cycle causes a blue spectrum shift in the charge trap distribution in the charge trapping structure. The algorithm includes program verify operations after the program pulse, and completes when a successful program verify operation occurs after a number of refill cycles. The charge retention properties can be greatly improved by these refill cycles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.