Apparatus and methods for quadrature clock signal generation
US8760209B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2012 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Sep 27, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/033
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods for quadrature clock signal generation are provided. In certain implementations, a quadrature clock signal generator includes a sine-shaping filter and a polyphase filter. The sine-shaping filter can receive an input clock signal such as a square or rectangular wave and can filter the input clock signal to generate a sinusoidal clock signal. Additionally, the polyphase filter can use the sinusoidal clock signal to generate in-phase (I) and quadrature-phase (Q) clock signals, which can have a phase difference of about ninety degrees. In certain configurations, the in-phase and quadrature-phase clock signals generated by the polyphase filter can be buffered by a buffer circuit to generate in-phase and quadrature-phase sinusoidal reference clock signals suitable for use in a clock and data recover (CDR) system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.