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:
Jan. 08, 2013
Filed:
Dec. 22, 2010
Phase locked loop circuit including automatic frequency control circuit and operating method thereof
Hui Dong Lee, Daejeon, KR;
Seok Ju Yun, Daejeon, KR;
Kwi Dong Kim, Daejeon, KR;
Jong-kee Kwon, Daejeon, KR;
Sang-hyun Cho, Daejeon, KR;
Hui Dong Lee, Daejeon, KR;
Seok Ju Yun, Daejeon, KR;
Kwi Dong Kim, Daejeon, KR;
Jong-Kee Kwon, Daejeon, KR;
Sang-Hyun Cho, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
Provided is a PLL circuit including automatic frequency control circuit and an operating method thereof. The voltage controlled oscillator is primarily controlled by an automatic frequency control circuit, and is secondarily controlled by a loop filter. The voltage controlled oscillator outputs a coarsely-tuned oscillation signal when primarily controlled, and outputs a finely-tuned oscillation signal when secondarily controlled. The PLL circuit can have a quick frequency fixing time, and output the oscillation signal having a broad and stable frequency. Moreover, the noise characteristic of the PLL circuit is enhanced.