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:
Mar. 25, 2003
Filed:
May. 10, 2000
Robert William Walden, Bethlehem, PA (US);
Agere Systems Inc., Berkeley Heights, NJ (US);
Abstract
A method and apparatus are provided for matching the primary and parasitic capacitances of integrated circuit capacitors. The integrated circuit capacitors to be matched in accordance with the present invention can be of different sizes and connected in different circuit topologies. For example, the matching filter can have a differential filter capacitor structure and the reference circuit can have a single-ended filter configuration (or vice versa). The reference circuit to be matched is initially analyzed to identify the ratio of the primary capacitance, C , to the parasitic capacitance, C . Thereafter, a matching filter is selected with the desired topology and having the same ratio of the primary capacitance, C , to the parasitic capacitance, C , as the reference circuit (or a desired offset therefrom). A general technique is disclosed for analyzing capacitance circuits to identify the ratio of the primary capacitance, C , to the parasitic capacitance, C .