Analog comparator circuit for communication interfaces within a vehicle

An analog comparator circuit, for communication interfaces within a vehicle which is designed to detect an actuation of an actor (Ttx, S_ext), comprising:

• a unit for producing a supply voltage (CC, Vu3) for supplying the actor (Ttx, S_ext),
• a unit for producing a reference voltage (RVG;
• V_Ref) to be compared with the supply voltage (CC;
• Vu3),
• a transistor input stage (IS),
• a node point (EDMx) between the actor (Ttx, S_ext), the unit for producing a supply voltage (CC) and the transistor input stage (IS),
• a digital evaluation unit (DCU) for processing the output signal from the transistor input stage (IS) in such a manner that whether or not the actor (Ttx, S_ext) is actuated is detected,
• wherein the transistor input stage (IS) is in the form of an analog input stage (IS) that comprises:
• a transistor circuit with two transistors (T_mir1, T_mir2), of which an emitter of a first transistor (T+mir2) is functionally connected to the node point (EDMx) and an emitter of a second transistor (T_mir1) is functionally connected to the reference voltage (V_Ref) at the reference node (V_Ref), further comprising a collector resistance (R_mir1) associated with the second transistor (T_mir1) for limiting the collector current of the second transistor (T_mir1), as well as a base resistance (R_mir_b) produced for both transistors (T_mir1, T_mir2);
• or
• a current mirror comprising two transistors (T_mir1, T_mir2), of which a first transistor (T_mir2) is functionally connected to the node point (EDMx) and the second transistor (T_mir1) is functionally connected to the reference voltage (V_Ref) and is configured in the current feedback mode.