Single down-conversion television tuner
US8139159B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2007 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Jan 18, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/0042
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A television tuner employs a single down-conversion architecture to translate VHF/UHF TV signals to various standard IF frequencies. The television tuner includes a harmonic rejection and quadrature mixer and a quadrature mixer. The harmonic rejection and quadrature mixer mixes a first-band signal with a reference signal to output a first pair of in-phase and quadrature-phase signals with a harmonic-frequency component eliminated from the resulting signals. A quadrature mixer mixes a second-band signal with the reference signal to output a second pair of in-phase and quadrature-phase signals. A digital signal processing circuit coupled to both the harmonic rejection and quadrature mixer and the quadrature mixer for selectively processing either the first pair of in-phase and quadrature-phase signals or the second pair of in-phase and quadrature-phase signals to generate an output signal corresponding to a desired channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.