The present invention provides a sensor circuit. The sensor circuit comprises a first amplifier which receives a measurement signal via an input end thereof, amplifies the received signal, and outputs the amplified signal via a first output end thereof; a first current source which supplies current (Ir) flowing toward the input resistance (Ri) of the first amplifier; a second current source which supplies current (Ic) flowing toward the input capacitance (Ci) of the first amplifier; and a bias current source which reduces the direct current offset voltage in the output of the first amplifier.