Patent ID: 7635995

Claim:
A voltage comparator, whose input terminals (i) for two compared voltages are connected to gates of a first and a second transistor (t 1 , t 2 ), which are differentially connected and whose output currents are subtracted from each other to obtain a current difference and the said current difference is converted into voltage, which is amplified and conducted to a gate terminal (gtst) of a switching transistor (t 7 ) at an input of an output stage (O), which is provided with a digitizing circuit (dc), characterized in that a source of a limiting transistor (t 8 ′), whose gate is connected to a terminal (vsn) of a low supply voltage through third and fourth transistors (t 8 ″, t 8 ′″), series-connected behind each other and diode-connected, is connected to the gate terminal (gtst) of the switching transistor (t 7 ), that the voltage at the gate terminal (gtst) of the switching transistor (t 7 ) when the switching transistor is quiescent is equal to a value between eight and nine tenths of a switching voltage (Vsw) at the gate of the switching transistor (t 7 ), at which voltage the switching transistor t( 7 ) triggers a switching in the output stage (O), that the third and fourth transistors (t 8 ″, t 8 ′″), series-connected behind each other and diode-connected, are supplied by a similar current as the switching transistor (t 7 ) and that the switching transistor (t 7 ), the limiting transistor (t 8 ′) and the third and fourth transistors (t 8 ″, t 8 ′″), series-connected behind each other and diode-connected, are transistors of the same type.