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:
Dec. 11, 2007
Filed:
Oct. 27, 2005
Steven M. Clements, Raleigh, NC (US);
William P. Cornwell, Durham, NC (US);
Carrie E. Cox, Cary, NC (US);
Hayden C. Cranford, Jr., Cary, NC (US);
Todd M. Rasmus, Cary, NC (US);
Steven M. Clements, Raleigh, NC (US);
William P. Cornwell, Durham, NC (US);
Carrie E. Cox, Cary, NC (US);
Hayden C. Cranford, Jr., Cary, NC (US);
Todd M. Rasmus, Cary, NC (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A circuit design method and transmitter that enables flexible control of amplitude, pre-emphasis, and slew rate utilizing a design of a segmented self-series terminated (SSST) transmitter having a parallel configuration of multiple, individually controllable segments of dual pull-up and pull-down transistors. Amplitude control, slew rate control and pre-emphasis control are enabled by manipulation/selection of normal or inverted inputs for the various segments. Also provided is a mechanism for providing/maintaining accurate output across a self-series terminated (SST) transmitter by regulating the supply voltage. Regulation of the supply voltage allows compatibility with conventional serial link receiver termination voltages and protects the transmitter output devices when those voltages are larger than the normal supply for the devices.