Patent ID: 7795949

Claim:
A circuit comprising a voltage-controlled transistor (T 4 ), comprising: a first (+) and a second (−) supply potential (+,−); a first (T 1 ) and a second transistor (T 2 ); and an impedance (R 4 ); wherein a series circuit (R 4 , T 1 ) formed by a switching path of the first transistor (T 1 ) and the impedance (R 4 ) is coupled between the first supply potential (+) and a control input of the voltage-controlled transistor (T 4 ), wherein the impedance (R 4 ) is connected in a manner facing the first supply potential (+); wherein the first supply potential (+) is coupled to a control input of the first transistor (T 1 ) via a switching path of the second transistor (T 2 ); wherein a control input of the second transistor (T 2 ) is coupled to a connecting node (V 1 ) between the impedance (R 4 ) and the switching path of the first transistor (T 1 ) in such a way that a potential change at the connecting node (V 1 ) switches the second transistor (T 2 ); wherein the circuit is configured in such a way that: as a result of the first transistor (T 1 ) being switched on in a manner mediated by means of a control signal, a first current flows through the series circuit (R 4 , T 1 ) and starts to subject the control input of the voltage-controlled transistor (T 4 ) to charge reversal in a first sense, the first current through the series circuit (R 4 , T 1 ) brings about a first potential shift at the connecting node (V 1 ), the second transistor (T 2 ) is switched on by this first potential shift and a second current therefore flows through the switching path of the second transistor (T 2 ) into the control input of the first transistor (T 1 ), which amplifies the first current, the increasing charge reversal of the control input of the voltage-controlled transistor (T 4 ) brings about a second potential shift at the connecting node (V 1 ), the second transistor (T 2 ) is switched off by this second potential shift, and the first transistor (T 1 ) remains switched on and holds the voltage-controlled transistor (T 4 ) in its new switching state; and wherein the circuit further comprises a first capacitor (C 1 ) coupled between the connecting node (V 1 ) and the control input of the second transistor (T 2 ), the first capacitor being subjected to charge reversal by the first potential shift via a resistor (R 3 ) in series with the first capacitor (C 1 ) in such a way that it supports a switching off of the second transistor (T 2 ) by the second potential shift.