Clock phase control with time distribution of phase corrections
US4493094A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1982 |
| Grant date | Jan 8, 1985 |
| Priority date | — |
| Expiry date | Aug 26, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0331
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A programmable oscillation counter (10) is initially synchronized by presetting the counter to a predetermined correct phase condition by applying thereto a single digital signal set representing the magnitude of the phase correction to be applied. Subsequent tracking of the correct phase condition is accomplished by utilizing additional two's-complement digital signal sets from time to time to preset an incremental counter (11) to a level which indicates the extent of phase error. The latter counter is controlled to reduce the error by altering the phase of the oscillation counter operation by one step at a time each time the oscillation counter cycles through a predetermined phase of its operation and until the incremental counter has counted down its preset phase error magnitude to zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.