Digital measurement of DAC switching mismatch error
US9716509B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 2016 |
| Grant date | Jul 25, 2017 |
| Priority date | — |
| Expiry date | Nov 23, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/74
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
For analog-to-digital converters (ADCs) which utilize a feedback digital-to-analog converter (DAC) for conversion, the final analog output can be affected or distorted by errors of the feedback DAC. A digital measurement technique can be implemented to determine switching mismatch error for the feedback DAC in a continuous-time delta-sigma modulator (CTDSM) or in a continuous-time pipeline modulator. The methodology forces each DAC unit elements (UEs) to switch a certain amount times and then use the modulator itself to measure the errors caused by those switching activities respectively. The obtained errors can be stored in a look-up table and fully corrected in digital domain or analog domain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.