Dual-channel class-D audio amplifier having quantizer-combined orthogonal modulation
US11329617B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 2021 |
| Grant date | May 10, 2022 |
| Priority date | — |
| Expiry date | Jan 19, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/56
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Class-D amplifiers and modulators therefor provide control of the DC operating point of the outputs of the amplifiers. The modulators generate a sum and difference signal using combiners and introduce the sum signal to a reference input of the quantizer, while the quantization input of the quantizer receives the difference signal. A difference mode loop filter circuit may filter the difference signal and a common mode loop filter may filter the sum signal. Outputs of the quantizer operate a pair of switching circuits to provide either a differential output with the sum signal set to a constant voltage and the difference signal provided by the signal to be reproduced, or a pair of single-ended outputs with the individual input signals used to generate the sum and difference signal, and selection of a differential or dual single-ended operating mode may be performed by a control circuit that reconfigures the combiners.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.