Differential charge pump with common mode control
US7952424B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2004 |
| Grant date | May 31, 2011 |
| Priority date | — |
| Expiry date | Apr 25, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Charge pump for providing an output current for charging and discharging a filter in accordance with an input signal, said charge pump comprising a first current source connectable with the input signal for driving the current source and adapted to providing a first current equal to a constant current Io plus a variable current Δx, said variable current Δx being directly proportional to the input signal, a second current source connectable with the input signal for driving the current source and adapted to providing a second current equal to the constant current Io minus said variable current Δx, and an output for providing the output current, wherein said output is connected to both the first and second current source in such a way, that the output current is equal to a difference between the first and second current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.