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. 04, 2011
Filed:
Oct. 16, 2009
Byung Hun Min, Gunsan, KR;
Ja Yol Lee, Daejeon, KR;
Seong DO Kim, Daejeon, KR;
Cheon Soo Kim, Daejeon, KR;
Hyun Kyu Yu, Daejeon, KR;
Byung Hun Min, Gunsan, KR;
Ja Yol Lee, Daejeon, KR;
Seong Do Kim, Daejeon, KR;
Cheon Soo Kim, Daejeon, KR;
Hyun Kyu Yu, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
A frequency calibration loop circuit having a pre-set frequency channel word (FCW) command value, a bit inputted to obtain a target frequency in an oscillator and a pre-set minimum division ratio n (n is a constant) of a programmable divider, includes: an oscillator adjusting an oscillation frequency of an oscillation signal according to a control value; a programmable divider dividing the oscillation signal according to a division ratio to output a divided signal; a counter counting the number of clocks of the divided signal for one cycle of a reference signal to output a count value; and a frequency detector obtaining the control value by subtracting the count value from a reference comparison value, wherein the reference comparison value is obtained by dividing a Frequency Channel Word (FCW) command value by a minimum division ratio of the programmable divider.