Patent ID: 6445239
Filing Date: 2002-09-03
Classification: H04L

Abstract:
A bus coupler for coupling an input driving line to a bus conductor of a bus system that conveys AC voltage and DC voltage to make on-board voltage of a subscriber station available, comprising:an amplitude-controlled transmitting circuit, adapted to generate a substantially rectangular active pulse as a transmitting pulse and an equalizer pulse, the transmitting circuit including a transmitting stage, the transmitting stage including a transmitting transistor wherein a base of the transmitting transistor is connected to the input driving line, the transmitting stage further including a reducing transistor adapted to reduce a driving signal on the input driving line, the reducing transistor being a transmitter of an inverse type with respect to the transmitting transistor, a base of the reducing transistor being coupled to a tap of a voltage divider of the transmitting circuit, wherein a first external terminal of the voltage divider is coupled to a reference voltage and a second external terminal of the voltage divider is coupled to a first terminal of a capacitor, the capacitor functioning as a separating filter for the AC voltage, and wherein a second terminal of the capacitor and a collector of the transmitting transistor are coupled to the bus conductor.