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:
May. 27, 2003
Filed:
Jan. 03, 2002
Alex Levin, Port Orchard, WA (US);
Kim Soi Er, Sungai Ara., MY;
Intel Corporation, Santa Clara, CA (US);
Abstract
A method and apparatus for analog compensation of driver output signal slew rate against device impedance variation is described. The method includes a signal termination device coupled to a driver output pad. The driver includes a plurality of pull-up devices where each pull-up device is coupled between a driver supply voltage and the signal termination device. In addition, corresponding pull-down devices are coupled between a driver ground and the signal termination device. The driver includes pull-up and pull-down compensation resistive elements coupled in series between selected pull-down/pull-up devices and the signal termination device. Accordingly, the pull-up and pull-down compensation resistive elements provide analog compensation of a driver output signal slew rate against device impedance variation. Also, a slew rate of the driver output signal is within a predetermined slew rate range in order to avoid uncontrolled fast switching as well as unnecessarily slow switching in the driver output signal.