Clock-recovery device having cascaded resonance amplifiers
US5703912A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1996 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | May 13, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/125
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for clock recovery from an input signal, particularly an alternating input signal formed from a data signal, the invention calling for a filter/amplifier unit made up of several series-connected resonance ampliers to be formed in a regenerative frequency filter. Unlike series-connected resonance amplifiers without feedback, the filter/amplifier unit has an overall Q-factor in the feedback loop which increases essentially linearly with the number of resonance amplifiers and their Q-factor. This enables the required high overall Q-factor to be obtained for the clock-recovery circuit with a relatively low number of resonance amplifiers with a Q-factor which is low compared with the overall Q-factor. A slope detector, a frequency mixer and the resonance amplifiers have similar assemblies so that the circuit can be designed more simply as a solid-state integrated circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.