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. 16, 2009
Filed:
Aug. 09, 2007
Tin-sing Lam, Rowland Heights, CA (US);
Chao-tung Yang, Hsinchu, TW;
Heng-chih Lin, Hsinchu, TW;
Shou-fang Chen, Hsinchu, TW;
Sining Zhou, Irvine, CA (US);
Tin-Sing Lam, Rowland Heights, CA (US);
Chao-Tung Yang, Hsinchu, TW;
Heng-Chih Lin, Hsinchu, TW;
Shou-Fang Chen, Hsinchu, TW;
Sining Zhou, Irvine, CA (US);
MStar Semiconductor, Inc., Hsinchu, TW;
Abstract
A frequency switching method is used to make switching among a plurality of frequency signal sources each providing a specific frequency range covering multiple bands. The method includes steps of providing a target frequency data; selecting one of the frequency signal sources to output a first clock signal; generating a first frequency data according to the clock signal of the first frequency to compare with the target frequency data; outputting a second clock signal with the highest band of another one of the frequency signal sources possessing a frequency range higher than that of the selected frequency signal source when the target frequency data is greater than the first frequency data; and outputting the second clock signal with the lowest band of the selected frequency signal source when the target frequency data is smaller than the first frequency data.