Correction of nonlinear output distortion in a Delta Sigma DAC
US6150969A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1998 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | Sep 29, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/3026
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A delta sigma modulator of at least second order includes correction means applied to each feedback loop in the modulator, to account for systemic nonlinear output distortions. Since the output distortion is nonlinear, the correction applied to each feedback loop is nontrivially different. Such a corrected delta sigma modulator may be used in a demodulator including an output digital to analog converter (DAC) to account for systemic imperfections in the pulses formed by the DAC. The corrected delta sigma modulator is also useful in correcting output errors associated with high quality multilevel demodulators and class D power amplifiers. The corrected delta sigma modulator may be one bit or multilevel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.