Constant voltage charge-pump circuit with feedback
US6828851B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2002 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Oct 31, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charge-pump circuit generates a constant voltage higher than the available power supply. A feedback path maintains the voltage at a constant level in spite of power supply, temperature and process variations. This charge pump circuit includes a switched capacitor interface arranged to generate a target voltage that is used to activate and deactivate a bypass capacitor interface to maintain the constant voltage. The bypass capacitor interface is configured to complete the feedback path. The feedback helps to ensure that node n1, that is coupled to the output of the charge pump, stays at a constant potential, irrespective of the power supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.