Patent ID: 7098652
Filing Date: 2006-08-29
Classification: G01P

Abstract:
1. An analytical circuit for an inductive sensor, in particular for a sensor for sensing the rotational behavior of the crankshaft of a motor vehicle internal combustion engine, comprising: an electromagnetic sensor with external excitation by means of a constant current, a transconductance amplifier to whose inverting input the output signal of the sensor is fed, and whose output signal is converted in an inverting low-pass filter into a reference voltage which is supplied to the non-inverting input of the transconductance amplifier, a digitizing circuit comprising a Schmitt trigger and, in parallel with it, a voltage comparator, to both of which the output signal of the transconductance amplifier and the reference voltage are supplied, and whereby the Schmitt trigger outputs a hysteresis-affected output signal and the voltage comparator outputs a hysteresis-free output signal, and a logic circuit which forms a hysteresis-free output signal of the analytical circuit from the two output signals of the digitizing circuit and makes it available for further processing.