Gain calibration controller
US9941853B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 17, 2017 |
| Grant date | Apr 10, 2018 |
| Priority date | — |
| Expiry date | Jul 17, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/04
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A gain calibration controller and gain calibration method is described for calibrating the gain of a class D audio amplifier comprising an adjustable gain stage and a feedback path coupled to an output of a reconstruction filter. The gain calibration controller detects a first output noise level in a first frequency range and a second output noise level in a second higher frequency range, varies the gain of the adjustable gain stage, determines a minimum stable gain value of a stable gain range from a change in at least one of the first and second output noise level in response to varying the gain of the adjustable gain stage, and determines a maximum stable gain value of the stable gain range from a change in at least one of the first and second output noise level in response to varying the gain of the adjustable gain stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.