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:
Jun. 02, 1998
Filed:
Aug. 26, 1996
Richard Francis Frankeny, Elgin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A source terminated transmission line driver circuit with precise impedance matching capability and particularly suited for the output drivers of integrated circuit devices. The output transistors are operated in a current source mode using a common reference current, transistor dimension scaling, and current mirrors. The magnitude of the current provided by the output transistors is established to match the boundary conditions of the transmission line at turn-on and inherently matches the impedance characteristics upon the return of the reflected wave through conduction changes in the output transistors responsive to the transmission line voltage. The driver circuit transmits data signals over single or bus lines with minimum ringing.