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:
May. 23, 2017
Filed:
Jul. 21, 2015
Renesas Electronics Corporation, Kawasaki-shi, Kanagawa, JP;
Fumiyuki Adachi, Kanagawa, JP;
Renesas Electronics Corporation, Koutou-ku, Tokyo, JP;
Abstract
A spread spectrum clock generator includes: a phase comparing unit that receives a reference clock signal and a feedback clock signal, and generates a control voltage corresponding to a phase difference between the reference clock signal and the feedback clock signal; a voltage-controlled oscillator that oscillates at an oscillating frequency corresponding to the control voltage, and generates an output clock signal; a delta-sigma modulator that receives a waveform signal for controlling spreading of a spectrum of the output clock signal, and outputs bits larger than 1 bit based on the waveform signal; a control circuit that controls a multiplication number according to an output signal of the delta-signal modulator; and a divider that generates the feedback clock signal by dividing the output clock signal according to the multiplication number controlled by the control circuit, and supplies the feedback clock signal to the phase comparing unit.