Charge pump circuit for a phase locked loop
US9559708B2 · kind B2 · utility
0Cited by
2References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 5, 2016 |
| Grant date | Jan 31, 2017 |
| Priority date | — |
| Expiry date | Aug 5, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/099
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is a circuit including a phase frequency detector (PFD) configured to compare phases of an input signal and a feedback signal, and to generate first and second control signals as a function of that comparison. An attenuation circuit includes a capacitor coupled in series between a node and a switching node, and is configured to charge the capacitor and disconnect the switching node from ground based on assertion of the first control signal, and discharge the capacitor and connect the switching node to ground based on assertion of the second control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.