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. 05, 2019
Filed:
Jan. 27, 2017
Senta Sekido, Hyogo, JP;
Senta Sekido, Hyogo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A spread spectrum clock generator circuit includes a phase comparator; an oscillator to output an output clock signal; a phase selector to select one of phases equally dividing one cycle of the output clock signal, and to generate a phase shift clock signal having a rising edge in the selected phase; and a phase shift controller to control the phase selector. The phase shift controller generates a variable phase shift amount; determines the phase of the rising edge so that the cycle of the phase shift clock signal has a length changed from the cycle of the output clock signal by the variable phase shift amount added with a fixed phase shift amount; and changes a setting of an SS modulation profile if the selected phase exceeds an upper limit, falls below a lower limit, or is within the upper and lower limits.