Phase locked loop with limited lock time
US5986513A · kind A · utility
3Cited by
1References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 6, 1990 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Aug 6, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase locked loop circuit employing a single phase detector provides limited maximum lock time by avoiding hang-up. The circuit first establishes a gross indication of phase relation sufficient to establish a direction of phase shift away from the unstable equilibrium point. The phase is then shifted by a predetermined value to establish a bounded phase relation exclusive of the unstable equilibrium point and inclusive of the stable equilibrium point. Conventional phase locking then provides the desired frequency and phase relation, but without potential for hang-up.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.