High speed DLL offset cancellation
US8542043B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 2012 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | May 15, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0896
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In an embodiment, a primary charge pump and replica charge pump may be coupled to matching control mechanisms and loads. In an embodiment, the replica charge pump may produce an error current originating from charge pump timing mismatches in a steady locked loop state. The error current produced by the replica charge pump may be measured by a difference amplifier to adjust at least one current source to compensate for the error current originating from the timing mismatches. To adjust the current sources, the amplifier may cause the current source to produce an equal but opposite current to cancel the effects of the error current, resulting in a constant output voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.