Multistage bandpass .DELTA. .SIGMA. modulators and analog-to-digital converters
US5283578A · kind A · utility
71Cited by
8References
15Claims
0Family size
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Key dates
| Filing date | Nov 16, 1992 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Nov 16, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/402
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An architecture for oversampled delta-sigma (.DELTA.-.SIGMA.) analog-to-digital (A/D) conversion of high-frequency, narrow-band signals includes multistage .DELTA.-.SIGMA. modulators that incorporate band-reject noise shaping centered at one fourth the clock frequency Fs. These modulators cascaded with a bandpass digital filter also centered at a frequency of Fs/4 perform A/D conversion for high-frequency, narrow-band signals centered at the same frequency. The bandpass modulators are implemented by use of resonators in existing low-pass multistage modulators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.