Correction of systematic error in an oversampled analog-to-digital converter
US4951052A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Jul 10, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/456
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method for performing oversampled analog-to-digital conversion of an input signal to generate a conversion result signal essentially free of systematic errors in accordance with the invention includes the steps of: performing oversampled analog-to-digital conversion of the input signal to generate a preliminary conversion result signal accompanied by systematic error, performing oversampled analog-to-digital conversion of a zero-valued signal to generate a correction signal essentially consisting of a corresponding systematic error, and differentially combining the correction signal and the preliminary conversion result signal to generate the conversion result essentially free of systematic errors. In a structural embodiment of the invention the systematic error in an oversampled analog-to-digital converter is suppressed by subtracting from the conversion response the response of a similar oversampled analog-to-digital converter to the reference voltage as its analog input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.