Circuit and method for evaluating measuring signals and sensor system for the capacitive detection of obstacles

The invention relates to a circuit for evaluating measuring signals of at least one sensor with a control circuit 18, wherein by means of a drive section 26 of the control circuit 18, a drive signal having a first frequency is generated, wherein the at least one sensor is acted upon by the drive signal, wherein an evaluation electronics 20 for Generating an evaluation signal is provided starting from a measurement signal generated by the sensor, wherein the evaluation 20 has means 34 for generating a counter signal with the first frequency and variable phase position and means for superimposing the counter signal and the evaluation signal and wherein the resulting from the superposition of the counter signal and the evaluation signal resulting signal to a synchronous demodulator 32 of the transmitter 20 is supplied.