Abstract: A transmitter circuit including an impedance setting circuit having first and second legs, wherein each leg includes an adjustable pull-up resistance and an adjustable pull-down resistance connected in series between a supply terminal and a reference terminal. A first-leg-node, between the adjustable resistances of the first leg, is connected to a first bus terminal. A second-leg-node, between the adjustable resistances of the second leg, is connected to a second bus terminal. The controller detects a transition in a transmission data signal, and in response to a dominant to recessive transition the controller controls a voltage setting circuit to set the differential driver voltage on the bus to a recessive value; adjusts each of the adjustable pull-up resistances and the adjustable pull-down resistances with the same target impedance profile such that the transmitter circuit drives the bus with a target driver impedance for an active recessive period of a bit time.

Abstract: A catheter arrangement and use of a catheter arrangement in infusion therapy. The catheter arrangement includes a catheter with a housing body, a hollow needle, a tube fitted onto a distal end of the housing body, a valve element arranged in the housing body with a fluid passage, and a fluid-conducting path extending through the housing body, the fluid passage and the tube. The needle extends longitudinally through the fluid-conducting path in a state of readiness of the catheter arrangement, and is drawn out of the fluid-conducting path in a state of use of the catheter arrangement. The valve element has an elastic wall portion through which the fluid passage extends. The fluid passage can be shifted by a fluid-pressure-induced elastic deformation of the wall portion between an open state, in which the fluid passage is open, and a closed state, in which the fluid passage is closed.