Charge pump circuit
US7208996B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2005 |
| Grant date | Apr 24, 2007 |
| Priority date | — |
| Expiry date | Dec 9, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R19/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A reverse current is prevented in a charge pump circuit. A complementary pair of clocks CLK and *CLK varies while a first through a fourth charge transfer MOS transistors M11, M12, M13 and M14 are turned off. Then the second charge transfer MOS transistor M12 is turned on to discharge a first pumping capacitor CA and the third charge transfer MOS transistor M13 is turned on to charge a second pumping capacitor CB. Next, the complementary pair of clocks CLK and *CLK varies after the first through the fourth charge transfer MOS transistors M11, M12, M13 and M14 are turned off again. Then the fourth charge transfer MOS transistor M14 is turned on to discharge the second pumping capacitor CB and the first charge transfer MOS transistor M11 is turned on to charge the first pumping capacitor CA.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.