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:
Aug. 17, 2010
Filed:
Oct. 22, 2007
Chi-kung Kuan, Tao-Yuan Hsien, TW;
Chi-Kung Kuan, Tao-Yuan Hsien, TW;
Realtek Semiconductor Corp., Hsinchu, TW;
Abstract
A fraction-N frequency divider includes a multi-phase clock generator, a first phase selector, a second phase selector, a glitch-free multiplexer, a control circuit, and a counter. The multi-phase clock generator is used for generating a plurality of clock signals with different phases. The first phase selector selects one of the clock signals as a first clock signal according to a first phase selecting signal. The second phase selector selects one of the clock signals as a second clock signal according to a second phase selecting signal. The glitch-free multiplexer is used for selectively outputting one of the first and second clock signals. The control circuit generates the first and second phase selecting signals and controls the clock switching timing of the glitch-free multiplexer according to a divisor setting. The counter is used for generating a frequency-divided signal according to the output of the glitch-free multiplexer.