The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2018
Filed:
Jul. 17, 2017
Nxp B.v., Eindhoven, NL;
Fred Mostert, Horssen, NL;
NXP B.V., Eindhoven, NL;
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.