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:
Apr. 09, 2013
Filed:
Mar. 27, 2009
Ibuki Mori, Tokyo, JP;
Yoshihisa Yamada, Kiryu, JP;
Masashi Kono, Higashimurayama, JP;
Haruo Kobayashi, Kiryu, JP;
Toshio Sugiyama, Tokyo, JP;
Ibuki Mori, Tokyo, JP;
Yoshihisa Yamada, Kiryu, JP;
Masashi Kono, Higashimurayama, JP;
Haruo Kobayashi, Kiryu, JP;
Toshio Sugiyama, Tokyo, JP;
National University Corporation Gunma University, Gunma, JP;
Asahi Kasei Microdevices Corporation, Tokyo, JP;
Abstract
The invention provides a technique to widely spread the frequency spectrum of switching noise generated by a switching action and to reduce the noise level at a particular frequency. A switching regulator (A) includes a computing unit with computing function. First, in the computing unit, a pulse-width-modulation processing unit (PWM) () performs pulse-width-modulation processing of receiving a feedback signal corresponding to the output of a detectorto determine an on-duty cycle of a pulse signal. Subsequently, for the signal and data obtained by the PWM () to be subjected to further modulation processing for spectrum spreading, a branching processing is performed by making changing-over unit () randomly select asynchronous-modulation processing unit (ASM) () or pulse-position-modulation processing unit (PPM). When the PPM is selected, another branching processing is performed by making the changing-over unit () select a first PPM () or a second PPM () depending on the on-duty cycle.