Linear low noise phase-frequency detector
US6002273A · kind A · utility
30Cited by
8References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1998 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Oct 5, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0891
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase-frequency detector (110) includes an output stage (300) and a control stage (200). The output stage includes a pump up switched current source (350), a pump down switched current sink (360), and a constant current source (325) that are coupled to a charge pump output node (111). The control stage generates, in response to a divided variable frequency signal (FV) (136) and a reference frequency signal (FR) (106), a pump up control signal (246) and a pump down control signal (216).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.