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:
Jul. 06, 2004
Filed:
Oct. 22, 2002
Dialog Semiconductor GmbH, Kirchheim/Teck-Nabern, DE;
Abstract
A method for compensating for the pulse area error of a Class-D power amplifier is achieved; especially it compensates the variations in the supply voltage and similar dependencies. A Class-D Amplifier typically gets pulse coded digital input (PCM) and may comprise a Sigma Delta Modulator to generate the signals driving the power output stage, typically an H-Bridge. A fundamental idea of this invention is to measure the real area of the output pulses, where the area is defined as the pulse duration multiplied by the pulse voltage amplitude, and to compare it with the ideal nominal pulse area. The pulse area error is calculated and then subtracted from said amplifier's input data. Key element of this invention is the “Pulse Area Compensation Function”, which calculates said real pulse area (voltage amplitude multiplied by time), compares said real pulse area with said ideal pulse area and feeds the difference into the input of said Sigma Delta Modulator.