Frequency controlled ring oscillator having by passable stages
US5815043A · kind A · utility
41Cited by
4References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1997 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Feb 13, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/181
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved ring oscillator in which frequency drift is controlled to provide reasonable accuracy is disclosed. The improved ring oscillator eliminates the frequency drift due processing variances. The ring oscillator provided by the invention incurs substantially less frequency drift than a conventional ring oscillator, but the frequency of the ring oscillator is still dependent on temperature and voltage changes. The improved ring oscillator according to the invention is particularly suited for operating as a localized oscillator that is used to facilitate periodic refreshing of DRAM within a computer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.