Serial digital signal source with a cable damping simulator

摘要

Serial digital signal source (10) with:– a device for generating (12) of a predetermined serial digital signal;– a user interface (14) for the determination of said predetermined serial digital signal;– a cable damping simulator (20) with an ohmic resistor network (22) in l - the form of which, with an input terminal (24) of the cable damping simulator (20) is connected to the damping characteristics of a reference cable in the case of very low frequencies or to simulate in the case of direct current, and a bridged t - section (28) connected between an output of the ohmic resistance network (22) in l - the form and an output terminal of the cable damping simulator (20) is connected, in order to the damping characteristics of the reference cable to simulate in the case of higher frequencies, wherein the bridged t - section (28) a pair of resistors (r3, r4) in series circuit with the impedance matching, a plurality of rc - series - circuits (38, 40, 42), which at a transition (36) between the resistors (r3, r4) are coupled to the impedance matching, and a plurality of rl - parallel - circuits (30, 32, 34), which is looped in series between the ohmic resistance network..