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. 30, 2007
Filed:
Oct. 05, 2004
Ja Yol Lee, Daejeon-shi, KR;
Sang Heung Lee, Daejeon-shi, KR;
Jin Yeong Kang, Daejeon-shi, KR;
Seung Hyeub OH, Daejeon-shi, KR;
Ja Yol Lee, Daejeon-shi, KR;
Sang Heung Lee, Daejeon-shi, KR;
Jin Yeong Kang, Daejeon-shi, KR;
Seung Hyeub Oh, Daejeon-shi, KR;
Electronics and Telecommunications Research Institute, Daejeon-shi, KR;
Abstract
Provided is a voltage-controlled oscillator (VCO) using a current feedback network for use in a wireless communication terminal. The voltage-controlled oscillator has high input impedance and low output impedance, so that a degree of isolation from the external load is excellent, thereby preventing degradation of the Q-factor by the load in overall oscillation circuit. In the voltage-controlled oscillator of the present invention, an LC resonator is provided to generate positive feedback, and negative resistance may be obtained at a wider frequency range by tuning a varactor of the LC resonator. And a boosting inductor is inserted into the positive feedback loop to have a greater negative resistance, therefore it is possible to prevent a problem in which the oscillation does not occur due to the parasitic resistance components generated during circuit fabrication.