An electric amplifier circuit for amplifying an output signal of a microphone, comprising: - a supply input terminal to apply a supply potential (VDDA) for operating the electric amplifier circuit, - an input terminal to apply the output signal of the microphone, - an output terminal to output an output signal of the amplifier circuit, - a differential amplifier having a first input terminal (E110a) for applying a first input signal, a second input terminal (E110b) for applying a second input signal and an output terminal for outputting the output signal of the amplifier circuit, wherein the first input terminal (E110a) of the differential amplifier is coupled to the input terminal of the amplifier circuit, and the output terminal of the differential amplifier is coupled to the output terminal of the amplifier circuit, - a feedback path being coupled between the output terminal of the differential amplifier and the second input terminal (E110b) of the differential amplifier, - a charge supplying circuit comprising an electric charge storage circuit for storing a charge, wherein the charge supplying circuit is configured for supplying the charge to the feedback path, characterized in that the electric amplifier circuit comprises: - a first resistor and a second resistor, wherein the first resistor has a variable resistance and is arranged in the feedback path, wherein the second resistor is connected to the output terminal and the second input terminal (E110b) of the differential amplifier, wherein a gain of the differential amplifier is dependent on the relationship between the respective resistance of the first and the second resistor (170, 180), - a storage circuit for storing a value to set the gain of the differential amplifier, - wherein the resistance of the first resistor is set in dependence on the value stored in the storage circuit, - wherein the charge supplying circuit is coupled to the feedback path between the first resistor and the output terminal of the differential amplifier, - wherein the charge supplying circuit is configured to supply an amount of the charge to the feedback path in dependence on a change of the supply potential (VDDA) and in dependence on the value stored in the storage circuit. - a supply input terminal to apply a supply potential (VDDA) for operating the electric amplifier circuit, - an input terminal to apply the output signal of the microphone, - an output terminal to output an output signal of the amplifier circuit, - a differential amplifier having a first input terminal (E110a) for applying a first input signal, a second input terminal (E110b) for applying a second input signal and an output terminal for outputting the output signal of the amplifier circuit, wherein the first input terminal (E110a) of the differential amplifier is coupled to the input terminal of the amplifier circuit, and the output terminal of the differential amplifier is coupled to the output terminal of the amplifier circuit, - a feedback path being coupled between the output terminal of the differential amplifier and the second input terminal (E110b) of the differential amplifier, - a charge supplying circuit comprising an electric charge storage circuit for storing a charge, wherein the charge supplying circuit is configured for supplying the charge to the feedback path, characterized in that the electric amplifier circuit comprises: - a first resistor and a second resistor, wherein the first resistor has a variable resistance and is arranged in the feedback path, wherein the second resistor is connected to the output terminal and the second input terminal (E110b) of the differential amplifier, wherein a gain of the differential amplifier is dependent on the relationship between the respective resistance of the first and the second resistor (170, 180), - a storage circuit for storing a value to set the gain of the differential amplifier, - wherein the resistance of the first resistor is set in dependence on the value stored in the storage circuit, - wherein the charge supplying circuit is coupled to the feedback path between the first resistor and the output terminal of the differential amplifier, - wherein the charge supplying circuit is configured to supply an amount of the charge to the feedback path in dependence on a change of the supply potential (VDDA) and in dependence on the value stored in the storage circuit. - a first resistor and a second resistor, wherein the first resistor has a variable resistance and is arranged in the feedback path, wherein the second resistor is connected to the output terminal and the second input terminal (E110b) of the differential amplifier, wherein a gain of the differential amplifier is dependent on the relationship between the respective resistance of the first and the second resistor (170, 180), - a storage circuit for storing a value to set the gain of the differential amplifier, - wherein the resistance of the first resistor is set in dependence on the value stored in the storage circuit, - wherein the charge supplying circuit is coupled to the feedback path between the first resistor and the output terminal of the differential amplifier, - wherein the charge supplying circuit is configured to supply an amount of the charge to the feedback path in dependence on a change of the supply potential (VDDA) and in dependence on the value stored in the storage circuit.