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. 13, 1995
Filed:
Jul. 14, 1993
Donald D Baumann, San Jose, CA (US);
Echelon Corporation, Palo Alto, CA (US);
Abstract
A node power isolator for connecting a node of a two conductor transmission line network such as a twisted pair line to the network so as to enable the DC powering of the node from the network itself without significantly diminishing the signal levels on the network or interfering with the node's ability to receive signals from or transmit signals on the network. Current flow through the power isolator is through a transistor coupled in series with each transmission line to node connection, with the base to emitter voltage of the transistor clamped to be substantially constant at the signaling frequencies of interest, either directly by a capacitor connected there across, another circuit having a capacitor connected between the base and the emitter of another transistor or both. Various embodiments are disclosed.