Low power delta sigma converter
US5754131A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Jul 1, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/43
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A delta sigma modulator that has a low power dissipation without sacrificing modulator resolution includes, in one embodiment, a current mode digital to analog converter (DAC) in shunt with a conventional op amp in the first stage of the delta sigma modulator. By adding the current mode DAC in shunt with the first (or only) stage op amp of the delta sigma modulator, the slewing current needed during transients is provided by the combination of the op amp and DAC output signals. Since the DAC provides the slewing current required for the output signal change, the op amp need not apply the slewing current and therefore need only operate at low quiescent power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.