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:
Mar. 30, 2010
Filed:
Dec. 27, 2006
Seon-ho Han, Daejon, KR;
Cheon-soo Kim, Daejon, KR;
Seon-Ho Han, Daejon, KR;
Cheon-Soo Kim, Daejon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
Provided is an apparatus having a variable capacitor circuit which is capable of obtaining a constant gain with respect to a whole control voltage by using a linear variable frequency characteristic for a variation of the control voltages, to thereby attain a wide variable frequency range. For this, a variable capacitor circuit includes a plurality of variable capacitors being connected in parallel with each other and having different capacitances with respect to an input control voltage, wherein the sum of the variable capacitances of the plurality of variable capacitors at a same voltage level of the control voltage varied within the whole control voltage range has linearity.