A low-noise low-voltage low-power bulk-driven amplifier with chopper stabilization technique

A bulk-driven operational transconductance amplifier (OTA), which adopts the chopper stabilization technique to attenuate the flicker noise and offset, is proposed in this paper. Operating in the subthreshold region, the chopped bulk-driven OTA has the abilities to work in low-voltage condition, thus consuming only nanowatt power. The circuit was simulated on UMC 180 nm CMOS process. Simulation results show that the proposed OTA achieves a noise floor of 400 nV/√Hz and an offset of 366 µV, with only 346 nA power consumption under 0.5 V supply voltage.