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. 03, 2009
Filed:
Jun. 04, 2007
Hiroaki Kubo, Shiga-ken, JP;
Hiroaki Kubo, Shiga-ken, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Object To provide a highly accurate and stable pulse width modulation (PWM) pulse signal generation device compatible with high resolution images without increasing a basic frequency of an external oscillation circuit. Solving Means A PWM pulse signal generation device includes a first PLL control circuita ring oscillatorin which a plurality of basic delay elements are serially connected, and a delayed pulse generation circuit constituted by a delay ratio adjusting circuitand a delay circuit. The delay circuitis formed by setting one adjustment delay element having a delay ratio R that is adjusted by the delay ratio adjusting circuitat a first stage and a plurality of serially connecting basic delay elements. An output pulse signal from each delay element of the ring oscillatorand an output pulse signal from each delay element of the delay circuithaving a delay amount corresponding to the delay ratio are superimposed to perform pulse width modulation, whereby output pulses having various pulse widths can be generated.