Delta sigma modulator having programmable gain/attenuation
US5134401A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1991 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Mar 12, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/49
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A delta signma modulator is programmable to realize a number of different gain settings. A user of the delta sigma modulator (which may be a human or an electronic system) may select a setting among a plurality of available settings. Programmability of gain is realized by selectively controlling the rate of sampling of an analog input relative to the rate of sampling of a reference voltage and/or by controlling interspersing of samples of fixed voltage with the analog input or reference voltage. To effect a positive gain, the rate of sampling of the analog input is selected to the bar larged than that of the rate of sampling of the known reference voltage. Alternatively, or additionally, fixed voltage charge samples are interspersed with the reference. In contrast, to effect a negative gain, the rate of sampling of the analog input is set to be less than the rate of sampling of the reference voltage and/or samples of fixed voltage are interspersed with the analog input. Lastly, to effect no net gain, the rate of sampling of the analog input is set to be substantially equal to the rate of sampling of the reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.