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. 04, 2003
Filed:
Jul. 26, 2001
John Laurence Melanson, Austin, TX (US);
Eric Walburger, Austin, TX (US);
Johann Guy Gaboriau, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
An output stage includes a first output switch 201 having a current path for driving an output from a first voltage rail and a second output switch having a current path for selectively driving the output from a second voltage rail. A first reference switch is scaled with respects to first output switch and has a current path coupled to the first voltage rail. A second reference switch scaled with respects to second output switch has a current path coupled to a current path of first reference switch at a node and the second voltage rail. The logic measures an impedance mismatch between first and second reference switches and proportionally varies the impedance of a selected one of first and second output switches in response.