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:
May. 20, 2003
Filed:
May. 26, 1999
Spiro Poulis, Kearns, UT (US);
John Evans, Riverton, UT (US);
3Com Corporation, Santa Clara, CA (US);
Abstract
The present invention provides a line termination circuit for matching the characteristic impedance of a transmission line, or more generally, a network. The present invention receives the voltage as present on the transmission line and attenuates it such that circuit components rated for lower voltages may be used to produce the reflected impedance. The attenuated voltage is placed across a scaled impedance which results in a reflected impedance substantially equal to the characteristic impedance of the transmission line. The line termination circuit uses a feedback loop to reflect the ground referenced scaled impedance across the transmission lines. The circuit generates a current having a value of one over the characteristic impedance of the network, which ensures that the reflected impedance, from the network, is substantially equal to the characteristic impedance of the network.