Non-volatile memory with linear estimation of initial programming voltage
US7599223B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2006 |
| Grant date | Oct 6, 2009 |
| Priority date | — |
| Expiry date | Sep 12, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/12
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a non-volatile memory, a selected page on a word line is successively programmed by a series of voltage pulses of a staircase waveform with verifications in between the pulses until the page is verified to a designated pattern. The programming voltage at the time the page is programmed verified will be to estimate the initial value of a starting programming voltage for the page. The estimation is further refined by using the estimate from a first pass in a second pass. Also, when the test is over multiple blocks, sampling of word lines based on similar geometrical locations of the blocks can yield a starting programming voltage optimized for faster programming pages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.