Apparatus and methods for invertible sine-shaping for phase interpolation
US8754678B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 2013 |
| Grant date | Jun 17, 2014 |
| Priority date | — |
| Expiry date | Mar 15, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/002
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods for quadrature clock signal generation are provided. In certain implementations, an apparatus includes an invertible sine shaping filter configured to receive an in-phase clock signal, a quadrature-phase clock signal, and an inversion control signal. The invertible sine-shaping filter is further configured to filter the in-phase and quadrature-phase clock signals to generate sinusoidal in-phase and quadrature-phase clock signals. The invertible sine-shaping filter is further configured to selectively invert one or both of the in-phase and quadrature-phase clock signals based on an inversion control signal. The apparatus further includes a phase interpolator configured to generate an interpolated clock signal based on a weighted sum of the selectively inverted sinusoidal in-phase clock signal and the quadrature-phase sinusoidal clock signal. The in-phase clock signal and the quadrature-phase clock signal have a quadrature-phase relationship.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.