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. 25, 2016
Filed:
Aug. 17, 2010
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;
Yao-Chi Wang, Hsinchu Hsien, TW;
MSTAR SEMICONDUCTOR, INC., Hsinchu Hsien, TW;
Abstract
A frequency calibration apparatus, applied to a phase locked loop (PLL), includes a frequency detecting module and a search module. The frequency detecting module includes a first counter, a second counter and a comparing unit. During a monitoring period, the first counter and the second counter respectively generates a first count and a second count. The comparing unit compares the first count with the second count to generate a comparison result indicating at least three situations. The search module selects a frequency curve in response to the comparison result, and calibrates configuration of a voltage controlled oscillator (VCO) according to the frequency curve.