Signal processing stage and radio frequency tuner
US6791414B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2003 |
| Grant date | Sep 14, 2004 |
| Priority date | — |
| Expiry date | Apr 28, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G1/0023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A signal handling stage provides variable gain, for example for automatic gain control functions, in a radio frequency tuner. The stage comprises a transconductance stage having negative feedback via further transconductance stage. The output current of the transconductance stage is supplied to an AGC core, which steers the output current between output loads and loads for driving the transconductance stage in accordance with an AGC voltage. The amount of negative feedback is therefore varied in accordance with the AGC voltage. For relatively low gain, a large amount of feedback is used and this improves the distortion performance. For relatively high gain, the negative feedback is reduced but a good noise figure can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.