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:
Nov. 09, 2004
Filed:
Feb. 27, 2003
Michael K. Kerr, Johnson City, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A termination circuit for a differential transmission line. The termination circuit comprises a plurality of resistive sub circuits. Each of the resistive sub circuits comprises a PFET and an NFET in parallel. A first resistor is connected at one end to a drain of the NFET and a source of the PFET, and connected at an opposite end to one line of the differential transmission line. A second resistor is connected at one end to a source of the NFET and a drain of the PFET, and connected an opposite end to another line of the differential transmission line. Optionally, there is another resistor connected between the differential transmission line, whereby the termination resistance is based on this other resistance in parallel with one or more of the resistive sub circuits which are enabled. Means are provided to selectively enable one or more of the resistive sub circuits to yield a desired resistance to terminate the differential transmission line.