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A 0.09 \mu W Low Power Front-End Biopotential Amplifier for Biosignal Recording

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4 Author(s)
Yuhwai Tseng ; Electrical Engineering Department and Institute of Electrical Control Engineering, National Chiao Tung University, Hsinchu, Taiwan, R.O.C. ; Yingchieh Ho ; Shuoting Kao ; Chauchin Su

This work presents a biopotential front-end amplifier in which the MOS transistors are biased in subthreshold region with a supply voltage and current of 0.4-0.8 V and 0.23-1.86 μA, respectively, to reduce the system power. Flicker noise is then removed using a chopping technique, and differential interference produced by electrode impedance imbalance is suppressed using a Gm-C filter. Additionally, the circuit is fabricated using TSMC 0.18 μm CMOS technology with a core area of 0.77 × 0.36 mm2. With a minimum supply voltage of 0.4 V, the measured SNR and power consumption of the proposed IC chip are 54.1 dB and 0.09 μW , respectively.

Published in:

IEEE Transactions on Biomedical Circuits and Systems  (Volume:6 ,  Issue: 5 )