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:
Jan. 30, 2001
Filed:
Jun. 14, 1999
Applicant:
Inventor:
Horng-Der Chang, Hsinchu, TW;
Assignee:
Realtek Semiconductor Corp., Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/099 ; H03L 7/18 ; H03B 2/900 ;
U.S. Cl.
CPC ...
H03L 7/099 ; H03L 7/18 ; H03B 2/900 ;
Abstract
The present invention provides a phase-locked loop having a multi-phase voltage controlled oscillator. The phase-locked loop comprises a divided-by-N counter, a divided-by-M counter, a phase frequency detector, a charge pump, a loop filter, a multi-phase voltage controlled oscillator, a switching unit, and a clock counter. It utilizes a multi-phase voltage controlled oscillator instead of a conventional voltage controlled oscillator and a switching unit is used to select the output signal from the multi-phase voltage controlled oscillator. The switching time of the switching unit is controlled by the clock counter to achieve the effect of frequency expansion.