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. 09, 2010
Filed:
Feb. 09, 2006
Hao Zhu, Anhui Province, CN;
Haibin Huang, Shanghai, CN;
Yongqing Ren, Shanghai, CN;
Apexone Microelectronics Ltd., Shanghai, CN;
Abstract
A class-D amplifier () includes a logic circuit () for controlling the operation of a switching bridge (). The logic circuit () transmits the differential mode of a differential pulse width modulation input signal and deletes a central portion of the common mode of input signal, while preserving pulses of a minimum pulse width following a rising edge and preceding a falling edge in common mode of the input signal. Deleting the central portion of the common mode signal improves the efficiency and reduces the electromagnetic interference radiation of the class-D amplifier (). Preserving the pulses of the minimum pulse width ensures the proper operation of the switching elements () in the switching bridge (), thereby reducing the distortion in the signal amplification.