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:
Dec. 25, 2007
Filed:
Mar. 31, 2005
Tatsufumi Kurokawa, Kanagawa, JP;
Tatsufumi Kurokawa, Kanagawa, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
The class D amplifier according to an embodiment of the invention comprises a voltage control current source circuit for current—converting voice voltage signals Sin to be input to two signals with different polarities, capacitance elements for integration for storing the electric charge of each of the current—converted signals and feedback signals respectively, hysteresis comparators for PWM conversion for comparing the potential of the capacitance elements for integration and reference potential respectively, output buffers for amplifying the output thereof respectively, and constant current source feedback circuits for feeding back the output thereof respectively.