Automatic gain control circuit using gain shift
US8032099B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2008 |
| Grant date | Oct 4, 2011 |
| Priority date | — |
| Expiry date | Mar 15, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3068
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An AGC circuit includes a low noise RF amplifying module with an adjustable gain, a frequency converter, an IF/Baseband amplifying module with an adjustable gain, an A/D converter, an AGC module and a gain distribution module. The AGC module is configured for detecting a level of a digital IF/Baseband signal outputted from the A/D converter, comparing the detected level with a reference level and generating a digital AGC signal and a digital gain distribution control signal based upon the comparison result. The gain distribution module is subject to control of the digital AGC signal and digital gain distribution control signal and configured for generating digital gain control signals to selectively adjust at least one of the gains of the low noise RF amplifying module and the IF/Baseband amplifying module in a digital manner to keep an IF/Baseband signal outputted from the IF/Baseband amplifying module at a desired level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.