Digital phase-locked loop
US5648994A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1995 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Sep 14, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0004
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital phase-locked loop adjusts the phase of a Recovered Clock in the receiver under the condition of asynchronous serial data transmission so that the phases of the transmission data are locked in order to reduce errors in read data. The digital phase-locked loop includes a zero-phase start circuit, a phase-error detecting circuit, an error-filtering circuit, a Recovered Clock adjusting circuit and a clock-generation circuit. This phase-locked loop generates a set of clocks through the detection of the transmission data level in the zero-phase start circuit so as to lock the phase of the transmission data quickly, and the phase-error detecting circuit detects the phase error between the phase of the transmission data and the phase of the Recovered Clock, after which the phase error signal is filtered through the adaptive filtering circuit for conversion into error-adjusting signals. The Recovered Clock adjusting circuit adjusts the Recovered Clock phase according to this error adjusting signal so that the phase of the Recovered Clock and the phase of the transmission data corresponds. Therefore, the digital phase-locked loop is used to reduce the mismatch between the transmiss…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.