| 摘要 |
A current sense circuit (36) for sensing a current in a subscriber loop comprising a transformer having a first and second winding (L1, L2) coupled for sensing a differential current in a loop, a sense winding (L3) 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 transform er introduces a low insertion loss at a frequency of operation of the loop.</SD OAB>
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