Digital-to-analog converter with noiseshaping modulator, commutator and plurality of unit converters, and method
US6028544A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1998 |
| Grant date | Feb 22, 2000 |
| Priority date | — |
| Expiry date | Jan 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/304
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital-to-analog converter (200) has a first portion (208) which receives a digital input signal X (201') and has serially coupled a second portion (209) which provides an analog output signal Y (202'). The first portion (208) is a delta-sigma modulator with integrators (210 and 215), adders (203 and 205), a comparator (220) and delay stages (230 and 235). The second portion (209) comprises a commutator (260), unit converters (280-n) and an analog adder (290). In the second portion, the unit converters (280-n) can be mismatched. The first portion (208) provides a noise-shaped intermediate signal V (221') which has substantially zero noise at that frequencies where the mismatches would lead to unwanted spectral tones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.