Abstract: An analog current switch in bipolar technology in which an intermediate transistor (T.sub.i), which isolates the current injector (S) from the switching diode (D.sub.c), is biassed by means of a transistor (T) whose collector, which is coupled to its base, is connected to the base of the intermediate transistor (T.sub.i) and to the anode of a diode (D), the emitters of (T) and (T.sub.i) as well as the cathodes of (D) and (D.sub.c) being interconnected.

Abstract: An analogue current switch comprising a cascade of n identical switching elements, each element comprising an I.sup.2 L integrated current-injection logic gate having one or more collector outputs. The signal input (e.sub.1) is the emitter of the PNP injection transistor (T.sub.1), the switching-signal input (e.sub.2) is the base of the NPN switching transistor (T.sub.2), and the signal output (s) is the junction point of the emitter of T.sub.2 and the base of T.sub.1.

Abstract: For transferring a logic signal between a first stage and a second stage at higher level in an integrated current injection logic circuit formed by superimposed layers which are biassed with different voltages (for example an I.sup.2 L logic circuit), the collector of a first transistor at the output of the first stage controls the base of a first auxiliary transistor, whose collector is connected to the base of a second transistor, which provides the connection to the input of the second stage. In order to rapidly drain the charge stored in the base of the second transistor, said base is connected to the base of a third transistor, whose collector is connected to its base so as to form a current mirror. The switching time of the device in accordance with the invention is thus substantially reduced.