Patent ID: 8395432

Claim:
A sensor circuit comprising: a first amplifier receiving a measurement signal with an input terminal, amplifying the received signal, and outputting the amplified signal to a first output terminal of the first amplifier; a first current source comprising a non-inverting second amplifier connected between the first output terminal and the input terminal of the first amplifier, the first current source being configured for providing current flowing to a self input resistor of the first amplifier; a second current source providing current flowing to a self input capacitor of the first amplifier, wherein the second current source comprises a non-inverting third amplifier connencted between the first output terminal and the input terminal of the first amplifier; and a bias current source removing a DC offset voltage appearing at an output of the first amplifier, wherein the bias current source comprises an inverting fourth amplifier connected between the first output terminal and the input terminal of the first amplifier.