Threshold voltage convergence
US6728140B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2001 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Apr 16, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/3404
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A convergence signal includes a series of voltage pulses used to perform a convergence procedure in one or more flash EEPROM memory cells (transistors). In one instance subsequent voltage pulses in the convergence signal each have a higher voltage than the preceding pulse. In another instance, subsequent voltage pulses in the convergence signal each have a longer duration than the preceding pulse. An integrated circuit includes an array of memory cells and an erase control unit which controls the application of the convergence signal to one or more memory cells. The integrated circuit may be either serial or parallel flash EEPROM in which bulk, sector, or page mode erasing is used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.