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:
Feb. 19, 2008
Filed:
Dec. 27, 2005
Kuo-hung Wu, Tainan County, TW;
Kwang-hwa Liu, Sunnyvale, CA (US);
Cheng-nan Wu, Tainan County, TW;
Tyng-yang Chen, Tainan County, TW;
Kuo-Hung Wu, Tainan County, TW;
Kwang-Hwa Liu, Sunnyvale, CA (US);
Cheng-Nan Wu, Tainan County, TW;
Tyng-Yang Chen, Tainan County, TW;
Amazion Electronics, Inc., Tainan County, TW;
Abstract
A double reference wave modulation scheme for filterless power amplifiers is disclosed for reducing EMI and common mode voltages. In the filterless power amplifier, differential outputs for driving load impedance are feedback and corrected based on input audio signals. Reference wave generators generate reference waves. A control logic results pulses in the pair of differential outputs in response to a clock signal or a reference voltage and a cross relationship between the input audio signal and the first and second reference waves. Pulses of one of the differential outputs are not overlapped with pulses of the other of the differential outputs for eliminating common mode noises of the power amplifier.