Patent ID: 6690755
Filing Date: 2004-02-10
Classification: H02J,Y02E,Y04S

Abstract:
A circuit for detecting signals present on a bifilar voltage-supply and signal-transmission line, in which the signals are constituted by positive and negative variations of a supply potential of at least one of two wires of the line, comprising:a low-pass filter connected to the two wires of the line in order to supply, at an output terminal of the filter, a constant reference potential substantially equal to a supply potential of a preselected one of the two wires; a first threshold comparator having a reference input terminal and a threshold input terminal connected, respectively, to the output terminal of the filter and to the preselected wire of the two wires, and an output terminal which constitutes a first output terminal of the circuit; and a second threshold comparator having a reference input terminal and a threshold input terminal connected, respectively, to the preselected wire of the two wires and to the output terminal of the filter, and an output terminal which constitutes a second output terminal of the circuit.