The proposed ultra-low voltage, low power fourth-order low-pass filter demonstrates efficient performance for ECG signal processing applications.
Enables ultra-low-power ECG filtering in simulation; leaves open hardware validation before clinical use.
Summary An ultra‐low voltage, low power bulk‐driven voltage follower (VF) is proposed in this paper. Further, it is exploited to design a fourth‐order low‐pass filter (LPF) for electrocardiogram (ECG) signal processing. The filter is designed in UMC 180‐nm CMOS technology and operates with an ultra‐low supply voltage of 0.3 V. It consumes an extremely low power of 2.4 nW for a cutoff frequency of 100 Hz. Results of post‐layout simulation show that the proposed filter provides a dynamic range (DR) of 51.6 dB even from a 0.3‐V supply voltage. The filter achieves a Figure‐of‐merit (FoM) of 4.7 × 10 −15 , which is better than many designs listed in the literature.
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Rao et al. (2020) studied this question.
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