DA-converter system and a method for converting a multi-bit digital signal to an analog signal
US7345606B2 · kind B2 · utility
2Cited by
11References
8Claims
0Family size
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Key dates
| Filing date | Jan 18, 2005 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Jan 18, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/3022
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Consistent with an example embodiment a, DA-converter system comprises the cascade of a multi-bit sigma-delta modulator and a DA-converter. The quantization noise of the sigma-delta modulator is isolated; the isolated quantization noise is word-length reduced in a second noise shaper with frequency independent signal transfer function and the isolated word-length reduced quantization noise is subtracted from the quantization noise of said cascade. In another embodiment, the isolated quantization noise is amplified before and attenuated after the second noise shaper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.