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:
Apr. 21, 2009
Filed:
Feb. 03, 2005
Juan-antonio Carballo, San Jose, CA (US);
Kevin John Nowka, Georgetown, TX (US);
Ivan Vo, Austin, TX (US);
Seung-moon Yoo, Santa Clara, CA (US);
Juan-Antonio Carballo, San Jose, CA (US);
Kevin John Nowka, Georgetown, TX (US);
Ivan Vo, Austin, TX (US);
Seung-moon Yoo, Santa Clara, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A digital transmission circuit and method providing selectable power consumption via single-ended or differential operation improves the flexibility of an interface while reducing power consumption when possible. A differential path is provided through the transmitter output driver stages and portions are selectively disabled when the transmission circuit is in a lower-power operating mode. A single-ended to differential converter circuit can be used to construct a differential signal for output to the final driver stage. The selection of power mode can be made via feedback from a channel quality measurement unit or may be hardwired or selected under programmatic control. The longer delay or skew of the lower-power single-ended mode is compensated for by the relaxed requirements of the channel when conditions permit the use of the lower-power single-ended mode.