Gain-control method and device for cascaded amplifiers
US6927628B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2003 |
| Grant date | Aug 9, 2005 |
| Priority date | — |
| Expiry date | Apr 14, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3052
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A gain-control method and device that enable high-speed gain switching of cascaded programmable gain amplifiers (PGA) without a high-resolution A/D converter is provided. In one example, the gain-control method for cascaded PGAs detects all the input levels of the PGAs, calculates the optimum gains of the PGAs each on the basis of the detection results, and sets the obtained optimum gains of each of the PGAs at one time, whereby high-speed gain switching becomes possible. The gain-control device for cascaded PGAs that implements this gain-control method includes peak hold circuits that retain the input levels of each of the PGAs, a switch group that sequentially switches outputs of the peak hold circuits, an A/D converter that sequentially detects the outputs from the switch group, and a control and operation device that calculates the optimum gains of the PGAs from the detection results by the A/D converter to set the calculated optimum gains simultaneously to each of the PGAs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.