Two phase sampling for a delta sigma modulator
US5159341A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1991 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Mar 12, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/47
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A delta sigma modulator provides dual phase sampling of analog input and/or a reference voltage. This dual phase sampling may be realized using a switched capacitor circuit having dual legs with a capacitor on each such leg. The dual phase sampling of the reference voltage poses a complication that mandates the necessity of providing a compensation signal. The delta sigma modulator is provided with appropriate circuitry to provide a compensation signal that compensates for the reduced signal level due to the dual sampling. In particular, the delta sigma modulator compensates for the reduced level of the output from an integrating amplifier circuit due to the timing necessary to implement the dual sampling approach.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.