Phase lock detector
US5734273A · kind A · utility
4Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1995 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | Mar 15, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S331/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase lock detector for a digital phase locked loop frequency synthesiser in which phase errors, represented by phase error pulses of a duration equal to the relative time displacement of synthesised and reference waveforms in the phase locked loop, are compared with a predetermined time interval representing the maximum phase error acceptable in a phase-lock condition. A favourable result of the comparison may be required to persist for a predetermined time before a phase-lock indication is given, to avoid jitter or flicker of that indication in a near-lock situation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.