Continuous-time sigma-delta modulator with discrete time common-mode feedback
US6697001B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2002 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Dec 19, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/456
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Systems and methods are described for a continuous-time sigma-delta modulator with discrete time common-mode feedback. The method includes calculating an integrator input signal as a difference between an input signal and a modulation feedback signal, continuous time integrating the integrator input signal to produce an integrator output signal having a common mode voltage, determining the common mode voltage of the integrator output signal using a discrete-time process, determining an integrator feedback signal as a function of the common-mode voltage and feeding back the feedback signal to the integrator in order to maintain the common mode voltage at a substantially constant value, sampling and quantizing the integrator output signal to produce a sigma-delta modulated output signal and converting the sigma-delta modulated output signal from a digital signal to an analog signal, to produce the modulation feedback signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.