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:
Oct. 20, 2009
Filed:
Oct. 05, 2005
Chiu-hung Cheng, Hsinchu, TW;
Chih-jen Yen, Hsinchu, TW;
Chiu-Hung Cheng, Hsinchu, TW;
Chih-Jen Yen, Hsinchu, TW;
Novatek Microelectronics Corp., Hsinchu, TW;
Abstract
A method and an apparatus for stabilizing output from a Phase Lock Loop (PLL) and the PLL thereof is disclosed. The method mainly relates to enabling the control voltage of a voltage control oscillator VCO in the PLL remained unchanged by means of turning off a charge-discharge current source of a charge pump in a PLL in response to a detected reference signal lower than a default value. Furthermore, the method enables the pulse frequency output from the VCO no exceeding a default tolerant frequency range in a distance from a desired output frequency. Thus, when the reference signal resumes the original frequency, the PLL can quickly lock the phase and the frequency again.