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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/<inline-formula> <tex-math notation="LaTeX">$f$ </tex-math></inline-formula> 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-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> CMOS process. The CFIA shows an rms input referred noise voltage of <inline-formula> <tex-math notation="LaTeX">$0.75~\mu \text{V}$ </tex-math></inline-formula> within a bandwidth of 0.01–100 Hz, a common-mode rejection ratio of 125 dB, and total power dissipation of <inline-formula> <tex-math notation="LaTeX">$2.3~\mu \text{W}$ </tex-math></inline-formula> at a power supply voltage of 1 V.

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