Digitally gain-controlled amplifier, and camera using such an amplifier
US5917380A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1997 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | Jun 12, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45392
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to a digitally gain-controlled amplifier including a transconductance stage provided with means for producing, at each of its N current outputs, a current (Itr) having a variable component which is representative of the analog input voltage. The amplifier also includes a switching stage comprising N switches each controlling the activation or deactivation of one of the N current outputs of the transconductance stage. Finally, the amplifier has a current/voltage conversion stage having one voltage output constituting the analog output of the amplifier and supplying a voltage which is representative of the currents received at its N current inputs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.