Multiple mode analog-to-digital converter employing a single quantizer
US6362762B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2000 |
| Grant date | Mar 26, 2002 |
| Priority date | — |
| Expiry date | Aug 23, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/454
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Several delta-sigma modulator circuits and a single quantizer provide analog-to-digital conversion for multiple frequency bands. A wideband mode is provided by coupling an analog signal to be digitized directly to a quantizer. Narrowband modes are provided by switching the analog signal to be digitized into one of several delta-sigma modulator circuits. Noise shaping and filtering by the delta-sigma modulator circuits result in improved signal-to-noise-and-distortion performance and increased resolution. Performance is further enhanced by feeding back multiple bits output by the quantizer to the delta-sigma modulator circuits. The delta-sigma modulator circuits can be either continuous time or discrete time delta sigma modulators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.