Synchronizing method and apparatus
US6711227B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2000 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Feb 4, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2205/126
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
To synchronize a regularly occurring pulse train to the average of a bunched pulse train, an oscillator generates a plurality of differently phase shifted signals at a given frequency. One of the phase shifted signals is selected as an output signal. The output signal is compared with the bunched pulse train. The selected phase shifted signal is changed responsive to the comparison so the output signal occurs at the average frequency of the bunched pulse train. The oscillator is formed as a plurality of differential amplifier stages having equal controllable delays. The stages are connected together to form a ring oscillator. The output signal is compared with the bunched pulse train through a FIFO. A signal representative of the state of the FIFO is used as an error signal to control the selection of the phase shifted signal to be used as the output signal. A phase locked loop that synchronizes the phase shifted signal generating oscillator to a frequency reference is nested in the control loop that selects one of the phase shifted signals as the output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.