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. 14, 2014
Filed:
Sep. 20, 2010
Yao-chi Wang, Hsinchu Hsien, TW;
Ming-yu Hsieh, Hsinchu Hsien, TW;
Shih-chieh Yen, Hsinchu Hsien, TW;
Yao-Chi Wang, Hsinchu Hsien, TW;
Ming-Yu Hsieh, Hsinchu Hsien, TW;
Shih-Chieh Yen, Hsinchu Hsien, TW;
MStar Semiconductor, Inc., , TW;
Abstract
A voltage-controlled oscillator (VCO) control circuit, used for controlling a VCO to process phase locking procedure after receiving a frequency locking signal, comprises an operating frequency controller and a judgment unit. The operating frequency controller, coupled to the VCO and the judgment unit, generates one of a first control code and a second control code to the VCO. The judgment unit, coupled to an input end of the VCO, generates a phase locking signal according to a voltage control signal inputted to the VCO. When the operating frequency controller receives the frequency locking signal, the operating frequency controller generates a first control code to control the VCO to switch from a first candidate VCO curve to a second candidate VCO curve. When the operating frequency controller receives the phase locking signal, the operating frequency controller generates a second control code to control the VCO to switch from the second candidate VCO curve to the first candidate VCO curve.