A Chopper Stabilized Current-Feedback Instrumentation Amplifier for EEG Acquisition Applications

A low-noise, low-power, chopper-stabilized, current-feedback instrumentation amplifier (CFIA) for bio-potential signal acquisition applications is presented. The proposed design includes an ac-coupled chopper-stabilized CFIA to reduce 1/f noise. It also has a switched-capacitor integrator to reduce the input offset and provide a high-pass filter. The proposed amplifier is designed using a Samsung 0.13-μm CMOS process. The CFIA shows an rms input referred noise voltage of 0.75 μV within a bandwidth of 0.01-100 Hz, a common-mode rejection ratio of 125 dB, and total power dissipation of 2.3 μW at a power supply voltage of 1 V.