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. 15, 2014
Filed:
Apr. 30, 2013
Pmc-sierra Us, Inc., Sunnyvale, CA (US);
Michael Ben Venditti, Montreal, CA;
PMC-Sierra US, Inc., Sunnyvale, CA (US);
Abstract
A method and apparatus to independently adjust the output rise and fall time of a transmitter for the purposes of improving high-speed signaling characteristics and reducing electromagnetic interference (EMI). Also described is an apparatus to provide a high-speed edge-rate control feature. The disclosed method and apparatus for rise and fall time equalization has a closed-loop calibration system that includes an actuation apparatus within the transmitter driver, a sensing means at the output of the transmitter to measure the degree of rise/fall time imbalance, and a calibration state machine operating on the sensor output to devise correction control inputs to the actuator in the transmitter driver to correct the rise/fall time imbalance. Also described is how the actuation apparatus within the transmitter driver can further be used to provide an open-loop edge-rate control feature for the transmitter.