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  • Title: A 0.09 μW low power front-end biopotential amplifier for biosignal recording.
    Author: Tseng Y, Ho Y, Kao S, Su C.
    Journal: IEEE Trans Biomed Circuits Syst; 2012 Oct; 6(5):508-16. PubMed ID: 23853237.
    Abstract:
    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 0.09μW, respectively.
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