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. 25, 2004
Filed:
Nov. 09, 2000
Applicant:
Inventor:
Jonathan Kwan, Ottawa, CA;
Assignee:
Catena Networks, Inc., Redwood Shores, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M 3/00 ; H04M 7/00 ; H04M 1/00 ; H04M 9/00 ;
U.S. Cl.
CPC ...
H04M 3/00 ; H04M 7/00 ; H04M 1/00 ; H04M 9/00 ;
Abstract
A current sense circuit for sensing a current in a subscriber loop comprising a transformer having a first and second winding coupled for sensing a differential current in a loop, a sense winding for producing a sense current in response to a magnetic flux induced in the transformer due to the differential current, an amplifier circuit for receiving the sense current and wherein the sense current is indicative of a signal on the loop, and the amplifier being configured such that a transformer introduces a low insertion loss at a frequency of operation of the loop.