Exponential function generator and variable gain amplifier using the same
US7514980B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2006 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Sep 27, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G7/001
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an exponential function generator which is realized with only CMOS element without BJT element, not limited by the physical properties of the element or a square circuit, and not complicated in its configuration, and a variable gain amplifier using the same. The exponential function generator includes a voltage-current converter, 1st to nth curve generators for mirroring the current from the voltage-current converter, outputting a current adjusted according to a predetermined ratio, and an output end for outputting the sum of the current from the 1st to nth curve generators. The exponential current generator is configured to generate the current exponentially adjusted according to the control voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.