Digital noise-shaping filter with real coefficients and method for making the same
US6657572B2 · kind B2 · utility
6Cited by
6References
21Claims
0Family size
Inventors
Key dates
| Filing date | May 7, 2002 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | May 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/3028
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital noise-shaping filter with real coefficients for delta-sigma data converters used in a digital amplifier, 1-bit digital/analog converter, 1-bit analog/digital converter and the like, and a method for making the same. The present digital noise-shaping filter has improved noise suppression performance and system stability and reduced calculation complexity. To this end, the digital noise-shaping filter comprises a noise transfer function expressed by NTF(z)=−1+a1z−1+a2z−2+&Lgr;+aNz−N. The noise transfer function has optimum real coefficients or real coefficients approximating them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.