Leitungsempfängerschaltkreis mit Leitungsabschlußimpedanz

摘要

The present invention relates to a line receiver circuit with an input buffer section (1) having an input connected with a transmission line (TR). Termination impedance means (2) are provided for terminating the characteristic impedance of the transmission line (TR). The termination impedance means (2) comprises at least two controllable impedance elements (TZ1 to TZ3) each having an individual impedance control input for receiving an impedance control signal. Impedance control means comprise twin impedance means (4) with at least two controllable impedance elements (NZ1 to NZ3) and means (3) for generating individual control signals for each of the twin impedance elements such that said twin impedance approximates a target value. Moreover, there are means (VZ1 to VZ3) for providing a respective control signal for each of said termination impedance elements in a predetermined relation to the control signal for the respectively corresponding twin impedance element (NZ1 to NZ3).