Patent ID: 8227888

Claim:
A semiconductor component ( 10 , 40 ) comprising a first integrated circuit ( 16 ) in a substrate ( 12 , 14 ) which is adapted to produce electrical or electromagnetic signals with a high-frequency signal component, wherein the substrate ( 12 , 14 ) is such that at least a part of the high-frequency signal component can propagate on a surface of the substrate or in an interior of the substrate or both on the substrate surface and also in the substrate interior in the form of a high-frequency electrical or electromagnetic interference signal, a second integrated circuit ( 18 ) in the same substrate ( 12 , 14 ) which is such that its function can be compromised by the high-frequency interference signal, and a countersignal circuit ( 20 ) in the same substrate ( 12 , 14 ) which is adapted to deliver a high-frequency electrical or electromagnetic countersignal which at least at a selected location of the substrate surface or of the substrate interior ( 12 , 14 ) or both of the substrate surface and also the substrate interior attenuates or eliminates the interference signal, wherein the countersignal circuit ( 20 ) includes the following elements; a receiver ( 22 ) which is adapted to produce an electrical receiver signal dependent on the instantaneous field strength of the high-frequency signal component, and a shielding transistor ( 26 ) provided in the substrate and having a control electrode ( 24 ) and a first field electrode ( 28 ) and a second field electrode ( 30 ), whose control electrode ( 24 ) is connected on the input side to the receiver ( 22 ) and whose first and second field electrodes ( 28 , 30 ) are acted upon with a predeterminable first and second electrical potential respectively, wherein the shielding transistor is in the form of a field effect transistor ( 26 ), and wherein the second integrated circuit ( 18 ) is arranged in the substrate between doping regions ( 28 , 30 ) of the field effect transistor ( 26 ), which are associated with the source and the drain electrodes.