A Low Power Biopotential Amplifier based on Bulk Driven Quasi Floating Gate Technique

Design of low-power and low-noise Biopotential Amplifier (BPA) plays crucial role in the success of high end medical diagnosis systems. However, most of these researched BPAs face a major challenge of consuming large amount of power and also exhibit high values of Noise Efficiency Factor (NEF). Here we report the design of a BPA using Bulk-Driven Quasi-Floating Gate (BDQFG) technique which consumes only low-power (0.657 μW) and also exhibits NEF of 2.06. Circuit design and simulation have been performed in Cadence Analog Design Environment using standard 0.18 μm technology. Besides promising results on power and noise, design of the BPA using BDQFG technique has also been fine-tuned to achieve mid-band gain of 38.3 dB (from 2.9 Hz to -3dB frequency of 735.5 Hz) and phase margin of 80.6°.