Amplifier circuit for amplifying an output signal of a capacitive sensor, comprising: - a first input terminal (AIN) to receive the output signal (OS) of the capacitive sensor (M), - a second input terminal (BIN) to receive a bias voltage (Vbias) of the capacitive sensor (M), - an output terminal (AOUT) to provide an amplified output signal (AOS), - an amplifier (A) for amplifying the output signal (OS) having an input connection (A1) being coupled to the first input terminal (AIN) to receive the output signal (OS) and an output connection (A2) coupled to the output terminal (AOUT) to output the amplified output signal (AOS), - a feedback loop (FL) being arranged between the input connection (A1) and the output connection (A2) of the amplifier (A), wherein the feedback loop (FL) comprises a control circuit (CF) being configured to control a DC voltage level at the input connection (A1) of the amplifier (A), - a bias voltage sensing circuit (BVS) coupled to the second input terminal (BIN) to sense a change of the level of the bias voltage (Vbias) at the second input terminal (BIN), - characterized in that the bias voltage sensing circuit (BVS) is configured to change the bandwidth of the feedback loop (FL) in dependence on the sensed change of the level of the bias voltage (Vbias) such that the feedback loop (FL) is operated with a first value of the bandwidth, if no change of the level of the bias voltage (Vbias) is detected by the voltage sensing circuit (BVS), and the feedback loop (FL) is operated with a second value of the bandwidth being larger than the first value of the bandwidth, if the change of the level of the bias voltage (Vbias) is detected by the bias voltage sensing circuit (BVS). - a first input terminal (AIN) to receive the output signal (OS) of the capacitive sensor (M), - a second input terminal (BIN) to receive a bias voltage (Vbias) of the capacitive sensor (M), - an output terminal (AOUT) to provide an amplified output signal (AOS), - an amplifier (A) for amplifying the output signal (OS) having an input connection (A1) being coupled to the first input terminal (AIN) to receive the output signal (OS) and an output connection (A2) coupled to the output terminal (AOUT) to output the amplified output signal (AOS), - a feedback loop (FL) being arranged between the input connection (A1) and the output connection (A2) of the amplifier (A), wherein the feedback loop (FL) comprises a control circuit (CF) being configured to control a DC voltage level at the input connection (A1) of the amplifier (A), - a bias voltage sensing circuit (BVS) coupled to the second input terminal (BIN) to sense a change of the level of the bias voltage (Vbias) at the second input terminal (BIN), - characterized in that the bias voltage sensing circuit (BVS) is configured to change the bandwidth of the feedback loop (FL) in dependence on the sensed change of the level of the bias voltage (Vbias) such that the feedback loop (FL) is operated with a first value of the bandwidth, if no change of the level of the bias voltage (Vbias) is detected by the voltage sensing circuit (BVS), and the feedback loop (FL) is operated with a second value of the bandwidth being larger than the first value of the bandwidth, if the change of the level of the bias voltage (Vbias) is detected by the bias voltage sensing circuit (BVS). <EOS>