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. 19, 2020
Filed:
Nov. 19, 2018
Applicant:
International Business Machines Corporation, Armonk, NY (US);
Inventors:
Daniel Ramirez, Rochester, MN (US);
Eric J Lukes, Stewartville, MN (US);
Henry M Newshutz, Rochester, MN (US);
George F Paulik, Rochester, MN (US);
Raymond A Richetta, Rochester, MN (US);
Assignee:
INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H 7/30 (2006.01); H04L 25/02 (2006.01); H04L 25/03 (2006.01); H03H 11/28 (2006.01);
U.S. Cl.
CPC ...
H04L 25/0278 (2013.01); H03H 11/28 (2013.01); H04L 25/0272 (2013.01); H04L 25/03343 (2013.01);
Abstract
A method and apparatus to adjust a differential transmitter output impedance is disclosed. Output voltage is sampled and averaged to mitigate noise and leakage. Averaged uplevel and downlevel voltages are used to select a number of pullup devices and a number of pulldown devices to control the differential transmitter output impedance to match a distal termination resistance or a transmission line impedance.