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:
Feb. 03, 2004
Filed:
Dec. 17, 1999
Robert Henry Leonowich, Muhlenberg Township, PA (US);
Ayal Shoval, Whitehall, PA (US);
Agere Systems, Inc., Allentown, PA (US);
Abstract
A single, 10/100 twisted-pair driver for Ethernet and Fast Ethernet applications designed in a 0.25 &mgr;m, 3.3V, digital CMOS process is described. The combined driver sources either 10 Mbaud Manchester data or 125 Mbaud MLT3/NRZI data. In 10 Mbaud mode the driver incorporates programmable features such as an additional common-mode current for various linearity performance as function of power supply dissipation. In 125 Mbaud mode of operation, the driver can be configured for different duty cycle distortion and for various rise and fall-times as a trade-off in EMI performance and remote receiver cable length performance. As well, rise/fall-time asymmetry performance is programmable as a trade-off in supply power dissipation. The driver can be run optimally during a transition and sub-optimally when sending multiple “0” symbols to save power. These power dissipation numbers can be reduced through programmable modes when more relaxed performance targets are acceptable.