A circuit for implementation in a sensor, the circuit comprising: means (104,110) for filtering at least one of an input signal and a further signal derived from the input signal to produce an intermediate signal; means for amplifying the intermediate signal to produce an output signal, wherein the means for amplifying the intermediate signal comprises a first amplifier having a second input terminal for receiving the intermediate signal, a third input terminal for receiving a bias voltage, and a second (118,120) output terminal; means for generating a biasing feedback signal, the means for generating a biasing feedback signal comprises a second amplifier having a fourth input terminal, being an inverting terminal for receiving the intermediate signal, a fifth input terminal, begin a non-inverting terminal for receiving the bias voltage, and a third output terminal, wherein the third output terminal is connected to the second input terminal; the means (104,110) for filtering further includes a transimpedance amplifier and a capacitor; wherein the capacitor has a first input terminal coupled to a single output terminal of the transimpedance amplifier and a first output terminal electrically coupled to the second input terminal, the fourth input terminal, and the third output terminal, so that the second amplifier provides feedback current with respect to the capacitor depending upon the signals provided to the fourth and fifth input terminals (126, 130); the transimpedance amplifier comprises a sixth input terminal for receiving the input signal from a sensory device; and the first amplifier is a high transconductance amplifier and the second amplifier is a low transconductance amplifier. means (104,110) for filtering at least one of an input signal and a further signal derived from the input signal to produce an intermediate signal; means for amplifying the intermediate signal to produce an output signal, wherein the means for amplifying the intermediate signal comprises a first amplifier having a second input terminal for receiving the intermediate signal, a third input terminal for receiving a bias voltage, and a second (118,120) output terminal; means for generating a biasing feedback signal, the means for generating a biasing feedback signal comprises a second amplifier having a fourth input terminal, being an inverting terminal for receiving the intermediate signal, a fifth input terminal, begin a non-inverting terminal for receiving the bias voltage, and a third output terminal, wherein the third output terminal is connected to the second input terminal; the means (104,110) for filtering further includes a transimpedance amplifier and a capacitor; wherein the capacitor has a first input terminal coupled to a single output terminal of the transimpedance amplifier and a first output terminal electrically coupled to the second input terminal, the fourth input terminal, and the third output terminal, so that the second amplifier provides feedback current with respect to the capacitor depending upon the signals provided to the fourth and fifth input terminals (126, 130); the transimpedance amplifier comprises a sixth input terminal for receiving the input signal from a sensory device; and the first amplifier is a high transconductance amplifier and the second amplifier is a low transconductance amplifier.