Method for control of controllable high frequency attenuators, involves interconnecting output of amplifier with control input of attenuator, while adjusting common-mode potential of amplifier such that matching condition is satisfied

摘要

A balanced amplifier (VS) is used for controlling the damping characteristics of the high frequency (HF) attenuator. The output of balanced amplifier is interconnected with the control input of the HF attenuator, in each case, while adjusting the common-mode potential of the balanced amplifier such that the matching condition is satisfied. The potentials (U1,U2) for the damping elements (DU) are tapped and are supplied as input variables for regulating the common mode potential, by a reference current (I0) or by a reference impedance (Z0).