A LOW INSERTION LOSS CURRENT SENSE CIRCUIT FOR LINE CARDS

摘要

A current sense circuit for sensing a current in a subscriber loop comprisin g 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 amplifies circuit for receiving the sense current a nd 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 t he loop.