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. 31, 2013
Filed:
Mar. 02, 2013
Renesas Electronics Corporation, Kawasaki, JP;
Yoshitaka Taki, Kanagawa, JP;
Renesas Electronics Corporation, Kawasaki-shi, JP;
Abstract
An SSCG generating a center-spread modulated clock centering on a frequency obtained by multiplying an input reference clock frequency by a predetermined number is configured to include a phase comparator, a VCO, and a modulation circuit formed by a frequency divider and a division ratio modulation circuit. The division ratio modulation circuit supplies the frequency divider with a division ratio modulated above and below the predetermined multiplication number, and outputs a magnitude relationship involved as a spread direction identification signal. The diagnostic circuit includes a counter that counts the modulated clock and, based on the spread direction identification signal, performs counting operations during an up-spread or down-spread period. Based on the values counted for a predetermined period, the operating status of the SSCG is diagnosed for the presence or absence of a failure, for example.