Digital phase comparator
US5563531A · kind A · utility
8Cited by
4References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1994 |
| Grant date | Oct 8, 1996 |
| Priority date | — |
| Expiry date | Sep 15, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/008
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital phase comparator supplies digital values corresponding to the phase shifts between a first signal having a duty cycle of approximately 0.5 and a second signal. The comparator includes a one-way counter initialized at the frequency of the first signal and clocked by a clock signal having a high frequency with respect to the frequency of the first and second signals. A logic gate enables the counter when the first and second signals are in respective predetermined states. A phase shift is considered to be zero when it corresponds approximately to one half of the counter's capacity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.