System for logarithmically controlling multiple variable gain amplifiers
US7342451B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 2005 |
| Grant date | Mar 11, 2008 |
| Priority date | — |
| Expiry date | Feb 26, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06G7/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for producing a control signal to a plurality of amplifiers sections to vary the gain of each one of the plurality of amplifier sections as a linear natural logarithmic function of an input gain control signal. The system includes a master circuit for producing a pair of currents with a ratio proportional to the linear natural logarithmic function of the input gain signal and a differential voltage. Each one of the amplifier sections includes: a replica of a portion of the master circuit fed by the produced differential voltage for producing a pair of currents produced in the master circuit; and an amplifier fed by the produced replicated currents, such amplifier having a gain proportional to the ratio of such replicated currents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.