Delta-sigma converter with bandpass filter for noise reduction in receivers
US5027120A · kind A · utility
30Cited by
6References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 25, 1990 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | May 25, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/454
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Analogue signals are converted to digital data by use of a Sigma-Delta modulator including a pair of bandpass filters and a feedback loop including a digital to analogue converter. The tendency of such a circuit to instability is reduced or eliminated by making small variations in the phase of a clock controlling feedback pulses relative to a clock controlling data output pulses. As an alternative, corrections may be made to the feedback pulses by an additional feedback loop providing pulses for correcting the feedback pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.