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:
Oct. 02, 2007
Filed:
Nov. 20, 2003
Alvin Leng Sun Loke, Fort Collins, CO (US);
James Oliver Barnes, Fort Collins, CO (US);
Robert Keith Barnes, Fort Collins, CO (US);
Michael M. Oshima, Los Altos, CA (US);
Ronald Ray Kennedy, Fort Collins, CO (US);
Charles E. Moore, Loveland, CO (US);
Alvin Leng Sun Loke, Fort Collins, CO (US);
James Oliver Barnes, Fort Collins, CO (US);
Robert Keith Barnes, Fort Collins, CO (US);
Michael M. Oshima, Los Altos, CA (US);
Ronald Ray Kennedy, Fort Collins, CO (US);
Charles E. Moore, Loveland, CO (US);
Avago Technologies General IP (Singapore) Pte. Ltd., Singapore, SG;
Abstract
A phase-locked loop includes a voltage-controlled oscillator and a charge-pump loop filter. The voltage-controlled oscillator includes a varactor having a first set of capacitor cells configured to adjust a capacitance based on a first control voltage, and a second set of capacitor cells configured to adjust a capacitance based on a second control voltage. The charge-pump loop filter receives a first and a second update signal, each having at least one state based on a phase difference between a first clock and a second clock, and comprises a first component and a second component. The first component is configured to adjust, during an update period, a voltage across an impedance from a reference level based on the states of the first and second update signals and to return the voltage across the impedance to the reference level prior to an end of the update period, wherein the voltage across the impedance comprises the first control voltage. The second component is configured to adjust a voltage across a capacitor based on the states of the first and second input signals, wherein the voltage across the capacitor comprises the second control voltage.