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:
Sep. 23, 2003
Filed:
Apr. 23, 2002
Cangsang Zhao, Hillsboro, OR (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
The present invention is related to method and apparatus for reducing variations on damping factor and natural frequency in phase locked loops where a desired frequency range from a PLL is determined. A loop filter resistance of the PLL is adjustable to minimize variations on the damping factor of the PLL as the frequency of the PLL changes. Further, the frequency of an input clock to the PLL may be determined along with a value of a PLL frequency multiplier. A first ratio of the current in a first charge pump to a VCO tail current and a second ratio of the current in a second charge pump to the VCO tail current may be adjusted, where the first ratio and the second ratio are adjustable to minimize variations on the natural frequency of the PLL as the input clock frequency and/or the PLL multiplier value of the PLL changes.