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:
Jul. 24, 2001
Filed:
Dec. 31, 1998
Donald M. Bartlett, Fort Collins, CO (US);
LSI Logic Corporation, Milpitas, CA (US);
Abstract
The present invention includes a charge pump that has an advantageous use in a phase-lock loop. The charge pump includes a current mirror, at least two switches and a loop. The current mirror pumps up loop filters according to input signals. The loop senses the common mode of loop filter nodes and compares them to a reference voltage. If the common mode is not at a desired level, then the loop provides leakage paths that are turned on to bring the nodes to that desired level. The use of the current mirror substantially reduces current mismatch. Furthermore, the loop is active for a relatively short time, thus minimizing the introduction of any errors. The present invention reduces static phase error by reducing current mismatch.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile