Direct conversion tuner
US7636558B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 2006 |
| Grant date | Dec 22, 2009 |
| Priority date | — |
| Expiry date | Apr 25, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A direct conversion tuner down-converts television signals, cable signals, or other signals directly from an RF frequency to an IF frequency and/or baseband, without an intermediate up-conversion step for image rejection. The direct conversion tuner includes a pre-select filter, an amplifier, an image reject mixer, and a poly-phase filter. The pre-select filter, amplifier, and the image reject mixer can be calibrated to provide sufficient image rejection to meet the NTSC requirements for TV signals. The entire direct conversion tuner can be fabricated on a single semiconductor substrate without requiring any off-chip components. The tuner configuration described herein is not limited to processing TV signals, and can be utilized to down-convert other RF signals to an IF frequency or baseband.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.