Digital broadcast receiving tuner and receiving device incorporating it
US7515886B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 2004 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Apr 21, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a digital broadcast receiving tuner, a down-converter unit converts a high-frequency signal into a baseband signal directly or by once converting it into an intermediate frequency signal. A gain adjuster unit properly adjusts the actual level of the high-frequency signal and/or the intermediate frequency signal in correspondence with an AGC (automatic gain control) controlling voltage supplied from an external source. An amplifier properly adjusts the actual level of the baseband signal. A controlling unit properly controls the actual gain of the amplifier in response to a specific signal independent of the AGC controlling voltage. This configuration makes it possible to constantly secure optimal performance characteristics in whatever condition the received signal may be.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.