Differential sigma-delta DAC with dynamic spectral shaping
US6677876B1 · kind B1 · utility
11Cited by
6References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 27, 2002 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Aug 27, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/3033
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A sigma-delta DAC circuit 10 includes a sigma-delta modulator 12 for producing and outputting an n-bit digital signal representative of an input analog signal, wherein n is a positive integer greater than 1, and is preferably equal to 4, 5 or 6. A differential n-bit DAC 30 is for converting a 2n−1-bit digital signal and a 2n−1-bit inverted digital signal processed and output by a bit shifter 24 and a differential decoder 18 to a differential analog signal. The sigma-delta modulator has a movable zero for enabling dynamic spectral shaping of the differential analog signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.