Analog-to-digital converters using multistage bandpass delta sigma modulators with arbitrary center frequency
US5500645A · kind A · utility
54Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1994 |
| Grant date | Mar 19, 1996 |
| Priority date | — |
| Expiry date | Mar 14, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/414
- 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 an arbitrary center frequency F.sub.bp. These modulators cascaded with a bandpass digital filter centered at the arbitrary center frequency F.sub.bp perform A/D conversion for high-frequency, narrow-band signals having the same arbitrary frequency. The bandpass modulators are implemented by use of resonators which provide a substantially large gain at the arbitrary frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.