Loop filter architecture
US6600351B2 · kind B2 · utility
72Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 2002 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Feb 8, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0893
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase-lock loop (PLL) filter architecture includes a first charge pump (508) and a second change pump (510). The second charge pump (510) operates in opposite phase of the first charge pump (508) in order to take away excess charge from the loop filter capacitor(s). By using a second charge pump as described, the PLL filter does not require the use of a large capacitor and can therefore be integrated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.