Dual EEPROM cell with current mirror differential read
US5148395A · kind A · utility
5Cited by
8References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1989 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Apr 26, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An EEPROM device having dual EEPROM transistor blocks for storing a charge and a current mirror for determining the difference in charge between the EEPROM transistor blocks. During a write operation, one EEPROM transistor block is charged while the other block is discharged. During a read operation, the current mirror attempts to supply equal current to each of the EEPROM transistor blocks. However, because each block has a different charge, more current will be forced through one leg of the current mirror. This results in a voltage difference across the legs of the current mirror which can be read by a voltage sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.