CIRCUIT ARRANGEMENT FOR EVALUTATING THE OUTPUT SIGNAL FROM AN ACTIVE SENSOR

摘要

For evaluating the output signal in the form of a binary current signal (IS) from an active sensor (1), a circuit is proposed in which a proportional current is derived from the sensor current (IS) with the aid of a current balancing circuit (2, 2'), and the current (I1) resulting from current balancing is drawn off from a stabilised voltage source (UK) via an ohmic resistor (R1), thereby generating a binary voltage signal (V1) which is applied to a flipflop (3) comparing the voltage signal (V1) with a reference voltage (UBez) composed of a reference voltage (URef) and a hysteresis voltage. The switching threshold of the flipflop (3) is varied or adjusted in accordance with the actual sensor current (IS), leakage currents, etc.