Circuit arrangement for a pulse-controlled connection of a telecommunication signal source to a telecommunication signal load

Claim 1

A circuit arrangement for a pulse-connection of a telecommunication signal source to a telecommunication signal load, comprising a semiconductor device having a main current path and a control-current path partially coinciding with the main current path, the main current path forming a low impedance for currents exceeding a given holding current and a high impedance for currents lower than said holding current, the control-current path reducing said holding current for controlcurrents of a given polarity, means for connecting said main current path between said source and said load, means for connecting said control-current path to a control-terminal, means for connecting a control-pulse source to the control-terminal, means for connecting a direct-current source to said main current path, and an element connected between the control-current path and the control-terminal having a low differential resistance for currents of a polarity opposite said given polarity and having a value lower than a given first value and a high differential resistance for currents of said opposite polarity and having a value exceeding said given first value, said low differential resistance comprising a differential resistance of such value that the current in the control-current path may fluctuate above and below the holding current in response to differential changes in the voltage on the control terminal, said high differential resistance comprising a differential resistance of such value that differential changes in the voltage on the control terminal produce substantially no differential changes of current in the control-current path.