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. 29, 2015
Filed:
Jan. 30, 2014
Silicon Image, Inc., Sunnyvale, CA (US);
Baoli Tong, Shanghai, CN;
Fei Song, Shanghai, CN;
Xiaozhi Lin, Shanghai, CN;
Xiaofeng Wang, Shanghai, CN;
Lattice Semiconductor Corporation, Portland, OR (US);
Abstract
Embodiments of the invention are generally directed to charge pump calibration for a dual-path phase-locked loop circuit. An embodiment of an apparatus includes a phase frequency detector; an integral path including a first charge pump; a proportional path including a second charge pump; and a calibration mechanism for the first charge pump and the second charge pump, the calibration mechanism including a phase detector to detect whether a reference clock signal or a feedback clock signal is leading or lagging in phase and to generate a signal indicating which clock signal is leading or lagging, a first memory element and a second memory element to store the signal from the phase detector, a first control logic to adjust current for the first charge pump based on the value stored in the first memory element, and a second control logic to adjust current for the second charge pump based on the value stored in the second memory element.