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:
Sep. 25, 2012
Filed:
Sep. 14, 2010
Sang Hyun Cho, Daejeon, KR;
Hui Dong Lee, Daejeon, KR;
Kwi Dong Kim, Daejeon, KR;
Jong Kee Kwon, Daejeon, KR;
Seung Tak Ryu, Daejeon, KR;
Sang Hyun Cho, Daejeon, KR;
Hui Dong Lee, Daejeon, KR;
Kwi Dong Kim, Daejeon, KR;
Jong Kee Kwon, Daejeon, KR;
Seung Tak Ryu, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
A phase-locked loop (PLL) circuit including a voltage-controlled oscillator (VCO) with a variable gain is provided. A phase frequency detector (PFD) detects a phase difference between a reference signal and a PLL feedback signal. A charge pump and a loop filter sequentially process an output signal of the PFD. A VCO has different gains according to a mode transition. A control voltage applied to the VCO is selected from an output signal of the loop filter and an additional control signal according to the mode transition.