An amplifier circuit comprises a first operational transconductance amplifier (OTA) has an input that communicates with the output of the first amplifier. A third amplifier has an input that communicates with the input of the first amplifier and an output. A fourth OTA has an input that communicates with the output of the third amplifier and an output. A feedback resistance communicates with the input and the output of the fourth OTA. A capacitance communicates with the output of the fourth OTA and with the input of the second OTA.