Ferroelectric memory system and method of driving the same
US6157563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1999 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Jan 29, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C11/22
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Under application of a voltage V3 to a cell plate line PC, a voltage difference appearing on a bit line BL and an inverted bit line /BL in accordance with a polarized state of a memory cell capacitor and a line capacitance is amplified by a sense amplifier, thereby reading data. A read time for this read operation is tR, which is substantially the same as a write time tWL of L data and a write time tWH of H data. Also, the same voltage is used in a write operation and a read operation. Specifically, the operations are conducted with a write energy larger than a read energy. As a result, a read error can be avoided. Furthermore, since an energy not saturating polarization of a ferroelectric film is used in a write operation, there is no need to provide a voltage increasing circuit, and a high operation can be realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.