Timing signal recovery by superheterodyne phase locked loop
US6693860B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 2000 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Apr 17, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2007/047
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for recovering the timing reference signal includes a superheterodyne phase locked loop. The recovery circuit avoids the need for a phase linear filter with a large percentage bandwidth and allows placement of the filter at a point in the recovery circuit where the center frequency to be passed is substantially fixed. The recovery circuit thus constructed further allows the bandwidth of the filter to be narrower and tailored to match the modulation characteristics of the timing recovery signal. This further results in a better signal-to-noise ratio into a limiter and phase detector, improving the performance of the phase locked loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.