Sensor and method for reducing an interference signal component in a measuring signal from a sensor

A sensor, comprising:

• a sensor element configured to acquire a measuring signal, the measuring signal including at least one useful signal component in a useful signal frequency range and at least one interference signal component in an interference signal frequency range;
• a readout circuit configured to convert the measuring signal into an analog electrical sensor signal;
• and
• a feedback circuit which feeds back an output signal of the readout circuit to an input of the readout circuit at which the measuring signal is applied, wherein a total transmission function of the readout circuit and the feedback circuit induces an attenuation of the analog sensor signal in the interference signal frequency range, while the analog sensor signal in the useful signal frequency range is not attenuated,
• wherein the feedback circuit is configured in such a way that a transmission function of the feedback circuit induces an attenuation of the analog sensor signal in the useful signal frequency range and an amplification of the analog sensor signal in the interference signal frequency range, and the output signal of the readout circuit is fed back to the input of the readout circuit where it is subtracted from the measuring signal.

A method for reducing an interference signal component in a measuring signal of a sensor, comprising the following steps:

• acquiring a measuring signal using the sensor, the measuring signal including at least one useful signal component in a useful signal frequency range and at least one interference signal component in an interference signal frequency range;
• converting the measuring signal into an analog electrical sensor signal using a readout circuit;
• and
• feeding, via a feedback circuit, an output signal of the readout circuit back to an input of the readout circuit at which the measuring signal is applied, wherein a total transmission function of the readout circuit and the feedback circuit induces an attenuation of the analog electrical signal in the interference signal frequency range, while the analog sensor signal in the useful signal frequency range is not attenuated,
• wherein the feedback circuit is configured in such a way that a transmission function of the feedback circuit induces an attenuation of the analog sensor signal in the useful signal frequency range and an amplification of the analog sensor signal in the interference signal frequency range.