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:
Jul. 05, 2011
Filed:
Feb. 25, 2009
Soo-won Kim, Seoul, KR;
Kyu-young Kim, Busan, KR;
Soo-Won Kim, Seoul, KR;
Kyu-Young Kim, Busan, KR;
Abstract
A programmable frequency divider, which is a core module of a frequency synthesizer using a Phase Locked Loop (PLL) for generating very high frequencies, includes a divided clock generator dividing a frequency of an input clock signal Fby a first divide ratio (N+1) or a second divide ratio N according to a divide ratio control signal MC to generate a plurality of divided clock signals D; a counting unit counting the number CNT of the plurality of divided clock signals D, by performing swallow mode counting and program mode counting sequentially on the plurality of divided clock signal D; a control signal generator generating the divide ratio control signal MC, using the number CNT of the plurality of divided clock signal D, a count S by the swallow mode counting and a count P by the program mode counting, the count P corresponding to a maximum of the number CNT, feeding the divide ratio control signal MC back to the divided clock generator, and generating a reset control signal RST for resetting the counting unit.