Combining continuous time and discrete time signal processing in a delta-sigma modulator
US5079550A · kind A · utility
50Cited by
5References
14Claims
0Family size
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Key dates
| Filing date | Oct 27, 1989 |
| Grant date | Jan 7, 1992 |
| Priority date | — |
| Expiry date | Oct 27, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/438
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oversampling analog-to-digital modulator includes an analog loop filter which has a first integrator stage which operates as a continuous time integrator. the second, third, and fourth integrator stages are discrete time or sampling integrators. The continuous time first integrator provides the required thermal noise characteristics of the loop filter while the discrete time integrator stages provide loop stability and transfer characteristics which are advantageous to the overall operation of the analog-to-digital modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.