Circuit and method for cancelling nonlinearity error associated with component value mismatches in a data converter
US5221926A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1992 |
| Grant date | Jun 22, 1993 |
| Priority date | — |
| Expiry date | Jul 1, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/502
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit (10) and method for minimizing nonlinearity errors in an oversampled data converter (40) resulting from errors in the intended values of components (42-49) of the converter (40). An adder section (11) is used to add a digital input sample to a previously existing sum generated from an immediately preceding digital input sample. A resulting sum is converter from binary code to thermometer code by an encoder (20). Combinatorial logic (24) is used to provide control signals for controlling switching of the components in a manner which both converts the nonlinearity error to a noise error and frequency shifts the noise error out of a frequency passband of the converter to higher frequencies where the error is subsequently filtered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.