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. 08, 2008
Filed:
Nov. 03, 2005
Kuo-hung Wu, Tainan County, TW;
Kuo-Hung Wu, Tainan County, TW;
Amazion Electronics, Inc., Hsinhua, Tainan County, TW;
Abstract
A double reference wave modulation scheme for filterless power amplifiers is disclosed for reducing EMI. In the filterless power amplifier, differential outputs for driving load impedance are corrected based on input audio signals by the error amplifier. Reference wave generators generate reference waves. Comparators are responsive to the reference waves and the input audio signal. Operation states of the switching unit are decided based on output signals of the comparators and the switching unit output the differential output. Besides, a feedback unit feeds the differential output back to the error amplifier. By this configuration, complex control logic is not needed.