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:
Mar. 22, 2011
Filed:
Jan. 06, 2009
Apparatus and method for improving the feedback linearity of a 1.5-bit sigma-delta class-d amplifier
Applicants:
Teng-hung Chang, Kaohsiung, TW;
Jwin-yen Guo, Jhubei, TW;
Inventors:
Teng-Hung Chang, Kaohsiung, TW;
Jwin-Yen Guo, Jhubei, TW;
Assignee:
Richtek Technology Corp., Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/38 (2006.01);
U.S. Cl.
CPC ...
Abstract
A conversion circuit is provided for a 1.5-bit Σ-Δ class-D amplifier to improve the feedback linearity of the class-D amplifier, by periodically inverting and mixing a first positive feedback signal and a first negative feedback signal from the power stage of the class-D amplifier to generate a second positive feedback signal and a second negative feedback signal with better linearity for feedback control in the class-D amplifier.