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. 12, 2013
Filed:
Jul. 07, 2011
Wei-chuan Cheng, Taipei, TW;
Jiann-chyi Sam Shieh, San Jose, CA (US);
Wei-Chuan Cheng, Taipei, TW;
Jiann-Chyi Sam Shieh, San Jose, CA (US);
Etron Technology, Inc., Hsinchu, TW;
Abstract
A dual-loop phase lock loop includes a phase frequency detector, a first charge pump, a second charge pump, a first capacitor, a filter, a first adder, a voltage controlled delay line, and a frequency divider. The phase frequency detector is used for outputting a switch signal according to a reference clock and a divided feedback clock. The first charge pump and the first capacitor are used for generating a coarse control voltage according to the switch signal. The second charge pump, the filter, and the first adder are used for generating a fine control voltage according to the switch signal and the coarse control voltage. The voltage controlled delay line is used for outputting a feedback clock according to the coarse control voltage and the fine control voltage. The frequency divider is used for dividing the feedback clock to output the divided feedback clock.