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. 29, 2003
Filed:
Oct. 10, 2001
John Michael Borkenhagen, Rochester, MN (US);
Moises Cases, Austin, TX (US);
Daniel Mark Dreps, Georgetown, TX (US);
David LeRoy Guertin, Rochester, MN (US);
Nam Huu Pham, Round Rock, TX (US);
Robert Russell Williams, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and system for reducing a reflection coefficient below a predetermined value thereby reducing jitter by the variation of the effective impedance of a driver appearing to be bounded during state transitions. The driver may include a pull-up driver and a pull-down driver. In the pull-up driver, the transistors may be switched from a first state to a second state in a staggered fashion where the first state is complementary to the second state; In the pull-down driver, the transistors may be switched from a second state to a first state in a staggered fashion. By staggering the switching of the transistors in the pull-up driver and the pull-down driver, a portion of the current may flow from the pull-up driver to the pull-down driver thereby causing the variation of the effective impedance of the driver to appear to be bounded during state transitions.