Charge pump circuit and method for phase locked loop
US7777541B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2007 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Mar 4, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0891
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A charge pump circuit can include a pump-up circuit having a first disable switch coupled between a pump-up output node and a first power supply node that is enabled and then disabled in response to a source current path between the pump-up node and a second power supply node being disabled, and a source off switch coupled in series with the first disable switch that is enabled in response to the source current path being disabled. The charge pump circuit can also include a pump-down circuit having a second disable switch coupled between a pump-down output node and the second power supply node that is enabled and then disabled in response to a sink current path between the pump-down node and a first power supply node being disabled. A sink off switch can be coupled in series with the second disable switch that is enabled in response to the sink current path being disabled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.