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:
Dec. 12, 2000
Filed:
Jun. 14, 1999
Applicant:
Inventor:
Horng-Der Chang, Hsinchu, TW;
Assignee:
REALTEK Semiconductor Corp., Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 25 ; 331 / ; 327158 ; 327159 ; 327161 ;
Abstract
A phase-locked loop which achieves the effect of frequency expansion is disclosed. An adjustable delay element is incorporated in a conventional phase-locked loop in order that one of the output clock signals of a divided-by-N counter and a divided-by-M counter leads (lags behind) the other. This in turn causes a phase frequency detector to alternately generate `up` and `dn` signals, thereby frequency expansion is achieved.