.DELTA..SIGMA. digital-to-analog converter with bit grouping by significance for reducing feedback computation time
US5079551A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1990 |
| Grant date | Jan 7, 1992 |
| Priority date | — |
| Expiry date | Jul 10, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/3028
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A .DELTA..SIGMA. modulation type 1-bit digital-to-analog conversion circuit includes an addition circuit for adding feedback digital data to input multi-bit digital data to provide results of addition, an integration circuit for integrating the results of addition provided by the addition circuit, a quantizer for quantizing output of the integration circuit to provide 1-bit digital data, and a circuit for providing analog data corresponding to the input multi-bit digital data on the basis of the 1-bit digital data. A bit of a predetermined order and bits of orders lower than the predetermined order in the feedback data are respectively made zero and bits of orders higher than the predetermined order only in the feedback data are added by the addition circuit. By feeding back only high order bits of feedback data for addition, the feedback addition is simplified and computation time thereby is shortened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.