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. 02, 2004
Filed:
May. 22, 2001
Masahiro Kishida, Higashihiroshima, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A digital switching amplifier is provided with attenuation sections that attenuate respective 1-bit signals that have been subjected to the power amplification. Also, an offset voltage addition and adjustment section adds adjustment voltages to output signals of the respective attenuation sections so that a D.C. voltage level difference between negative feedback signals which return to a delta sigma modulation circuit becomes substantially zero. This function ensures that the digital switching amplifier can avoid the gain with respect to positive and negative input signals change and easily avoid the noise that occurs in the lower frequency band due to an offset voltage.