Tunable narrow-band filter including sigma-delta modulator
US6876698B1 · kind B1 · utility
19Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2000 |
| Grant date | Apr 5, 2005 |
| Priority date | — |
| Expiry date | Aug 14, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2017/0692
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A tunable narrow-band filter that includes a sigma-delta modulator. In one embodiment, a conventional DC canceler is modified to include a re-quantizer in the feedback loop in the form of a ΣΔ modulator. In another embodiment, a digital receiver employs a processing chip, such as an FPGA, that includes a ΣΔ modulator to requantize oversampled control signals in the digital receiver. In still another embodiment, a wide-bandwidth sigma-delta loop has a tunable center frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.