Two-Stage Amplifier with Low Noise and Low Power Consumption for EEG Application

Operational Transconductance Amplifiers (OTAs) have been identified as a favourable element for enhancing Electroencephalogram (EEG) signals, owing to their superior gain, minimal noise, and reduced power consumption. This paper delineates the design of two-stage OTA, specifically tailored for low-noise and low-power EEG applications, consumes 5.55 µW with a 2.5V supply voltage. Simulated outcomes reveal that the differential gain surpasses 70dB, and the Common Mode Rejection Ratio (CMRR) exceeds 80dB, while maintaining a gain bandwidth below 1kHz. Furthermore, the incorporation of a Miller compensation capacitor enhances the phase margin to 61 degrees.