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:
Jun. 10, 2008
Filed:
Aug. 15, 2003
Yih-min Tu, Hualien, TW;
Yung-lung Chen, Taipei, TW;
Yuan-tung Peng, Hsinchu, TW;
Fan-chung Lee, Taipei, TW;
Yih-Min Tu, Hualien, TW;
Yung-Lung Chen, Taipei, TW;
Yuan-Tung Peng, Hsinchu, TW;
Fan-Chung Lee, Taipei, TW;
Novatek Microelectronics Corp., Hsinchu, TW;
Abstract
A voltage controlled oscillator (VCO), suitable for use in a frequency shift keying (FSK) system. The VCO device comprises a switching varactor unit, having a first terminal and a second terminal, wherein the switching varactor unit produces a capacitance, according to a frequency-selection voltage. A VCO core has a first output terminal, a second output terminal complementary to the first output terminal, and an input terminal. Wherein, the switching varactor unit is coupled in parallel with the VCO core at the first output terminal and the second output terminal to produce a capacitance effect with respect to the capacitance, so as to adjust a frequency constant √{square root over (LC)} of the VCO core.