Multiphase clock generation and calibration
US8294501B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2011 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Apr 27, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/197
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Systems and methods are disclosed for improving the accuracy of phase spacing of multiphase clocks. In one example, method includes receiving a reference clock having a first frequency and sampling the reference clock with a plurality of multiphase clocks having a second frequency to generate a plurality of samples. The second frequency is a non-integer multiple of the first frequency. The method also includes detecting transitions of the reference clock occurring between the samples generated from a plurality of pairs of the multiphase clocks and counting the transitions to generate a transition count for each pair of the multiphase clocks. The method also includes summing a set of the transition counts to generate a measured phase for a first multiphase clock, calculating a reference phase for the first multiphase clock, and generating a phase skew value for the first multiphase clock based on the measured phase and the reference phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.