Sigma-delta (ΣΔ) analog-to-digital converter (ADC) structure incorporating a direct sampling mixer
US7057540B2 · kind B2 · utility
25Cited by
12References
45Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2002 |
| Grant date | Jun 6, 2006 |
| Priority date | — |
| Expiry date | Oct 17, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1036
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A sigma-delta analog-to-digital converter-offers advantages such as noise shaping and high frequency operation. However, a sampling circuit needed to provide a highly oversampled discrete-time sample stream with low noise characteristics is difficult to design and implement. The present invention provides a sigma-delta mixer 300 with such a sampling circuit 310. The present invention discloses a sampling circuit using switched capacitors 307, 308, and 309 with low noise characteristics and at the same time is capable of providing a highly oversampled discrete-time sample stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.