Numerically controlled oscillator
US7570725B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2006 |
| Grant date | Aug 4, 2009 |
| Priority date | — |
| Expiry date | Aug 24, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A numerically controlled oscillator (NCO) is arranged to accumulate control values for each transition of a system clock to provide an accumulation signal and an edge signal. A speed multiplier value (N) is selected to simulate a desired clock resolution of N times the system clock resolution. The multi-phase predictive clock circuit is arranged to provide clock phase output signals that each correspond to a predicted clock phase as if the system clock where running at N times faster than the actual system clock. The edge detector circuit is arranged to compare values of adjacent clock phases to identify a transition in one of the clock phases. The phase encoder circuit is arranged to provide a phase signal that indicates a transition in one clock phase. The edge signal and the phase signal can be used for careful phase alignment control at effectively higher resolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.