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. 20, 2000
Filed:
Sep. 04, 1997
Shinichi Shiotsu, Kawasaki, JP;
Masaya Tamamura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A 1/N programmable frequency divider for dividing the frequency of an output clock CLK1 from a VCO is connected between the VCO and a phase comparator in a PLL circuit. An adjusting circuit includes a counter for detecting a half-value of the frequency and for addressing a table ROM to make it read out a program data N and target value TV, a counter for detecting a half-value of the frequency of the output clock CLK from the 1/N programmable frequency divider, a digital comparator for comparing the count value of the counter and the target value TV and an up/down counter for incrementing or decrementing is count CFV in accordance with the comparison result, the count CFV being provided to the control input of the VCO.