Class-D dynamic closed loop feedback amplifier
US10778160B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 27, 2018 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | Aug 15, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/351
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for stabilizing a Class-D audio amplifier having a loop bandwidth modulator configured to modulate a loop bandwidth of the amplifier as a function of one or more control signals, a tuned output filter terminator coupled to a low-pass filter and configured to provide stabilizing control feedback to loop bandwidth modulator, and a carrier injection system configured to provide a wide range fixed frequency operation. Also, a method of stabilizing a feedback network within a Class-D amplifier by providing a first feedback loop coupling an output of a PWM logic stage of the amplifier to an input circuit of the amplifier, providing a second feedback loop coupling an output of a switching output stage of the amplifier to the input circuit, and providing a third feedback loop coupling an output of a low-pass filter of the amplifier to the input circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.