Sigma-delta modulator with a quantizer/gain element
US7330142B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2004 |
| Grant date | Feb 12, 2008 |
| Priority date | — |
| Expiry date | Sep 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/304
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A sigma-delta modulator (SDM) including n (n>_1) integrators in series, where a first of the n integrators receiving an input signal, at least one Q device, which acts as a quantizer when an absolute value of a signal input thereto is smaller and as a gain element (either with or without offset) when the absolute value of the signal input thereto is larger, and a device for quantizing an output of the unit. The SDM may be a feed back or feed forward SDM. The SDM may include a single or multiple Q devices. The single Q device may be positioned so that the signal input to the one Q device is an output of the last integrator and the output of the one device Q1 is input to the device for quantizing and/or to the n integrators. For multiple Q devices, each of the Q devices may have different parameters set to improve stability, improve SNR, and/or reduce introduction of artifacts. The SDM may be part of an analog to digital converter and/or a digital to digital converter. The SDM may process digital or analog signals, for example, a 1-bit signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.