Sigma delta modulator having enlarged dynamic range due to stabilized signal swing
US6831577B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 2002 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Jan 31, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/454
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method for designing a single loop Sigma Delta Modulator, and a single loop Sigma Delta Modulator. A microphone comprising the above Sigma Delta Modulator (SDM) and a cellular phone or hearing aid incorporating the microphone. A design algorithm for an SDM is described said method resulting in a SDM with a maximum SNR for a given NTF order and the method assures stability while still keeping the distortion in the output signal at a minimum for signals exceeding MSA. The method further takes the presence of non idealities in i.e. components into consideration and makes the SDM less sensitive to these non idealities. Furthermore the method tailors the coefficients and the design of the NTF to fit a low power low voltage integrated circuit implementation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.