Delta sigma digital-to-analog converter
US6344812B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2000 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Jun 22, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/502
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved delta sigma digital-to-analog converter in which the thermometer code, which is output from a thermometer code converter, is divided into P blocks for every Q bits. An arrangement of the blocks is shifted in rotation by a barrel shifter at a frequency fs. Along with this, an arrangement of bits within each block is shifted in rotation by a shift register at a frequency of Q times fs. The bits within the code thus obtained are provided to local DACs, each specified to correspond to each of the given bits. In this manner, it is possible to maintain a lower operating frequency while at the same time to reducing the distortion in the output caused by a change in shifting the data in rotation in the local DACs, which change occurs depending on bit levels of the data in a form of the thermometer code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.