Bandpass delta-sigma modulator with distributed feedforward paths
US7034728B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2004 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Aug 11, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/452
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A delta-sigma modulator. The novel delta-sigma modulator includes one or more filter stages arranged in cascade, wherein each filter stage includes a first circuit for generating a first output signal and second circuit for generating a second output signal; and a summing circuit for adding the first and second output signals from each of the filter stages. In an illustrative embodiment, the first circuit is a bandpass filter including an inductive-capacitive resonator and the second circuit is an integrator, which generates a second output signal that is orthogonal to the first output signal. The output of the summing circuit is digitized and then converted back to analog to provide a feedback signal. The feedback signal is subtracted from an input signal, and the resultant difference signal is input to a first filter stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.