Apparatus for generating quadrature phase signals and data recovery circuit using the same
US6801066B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2003 |
| Grant date | Oct 5, 2004 |
| Priority date | — |
| Expiry date | Aug 26, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0025
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus for generating quadrature phase signals in a half-rate data recovery circuit, which is adapted to generate a first and a second clock signals having the same frequency and being 90 degrees out of phase with each other. The apparatus for generating quadrature phase signals mainly comprises a base selector, a first phase interpolator and a second phase interpolator. The base selector generates, based on a region control signal, a pair of phase region boundaries for the first clock signal as well as a pair of phase region boundaries for the second clock signal by using a plurality of reference clock signals. The first and second phase interpolators perform, based on a position control signal, weighted average processes for the two pairs of phase region boundaries, respectively, to thereby obtain the first and the second clock signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.